Below is a graph of the number of caterpillars in the corn field over 30 years. Which statement is most likely true? 1073 AQ 4 A. Normal corn, with insecticide, no refuge field. B. Normal corn, with insecticide, with refuge field. C. Caterpillar-resistant corn, no pesticide, no refuge field. D. Caterpillar-resistant corn, no pesticide, with refuge field.
Note that the based on the graph of the statement that is most likely true, is "Caterpillar-resistant corn, no pesticide, no refuge field." (Option C)
What is a graph?In discrete mathematics, and more particularly in graph theory, a graph is a structure consisting of a set of objects, some of which are "related" in some way.
The items correspond to mathematical abstractions known as vertices, and each pair of connected vertices is known as an edge.
Graphs are a popular way to visually depict data connections. A graph's objective is to convey facts that is too many or intricate to be fully expressed in words and in less space.
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Full Question:
Below is a graph of the number of caterpillars in the corn field over 30 years. Which statement is most likely true?
answer choices
Normal corn, with insecticide, no refuge field.
Normal corn, with insecticide, with refuge field.
Caterpillar-resistant corn, no pesticide, no refuge field.
Caterpillar-resistant corn, no pesticide, with refuge field.
Choose the correct statement about ionic crystals.
The total number of cations and anions are the same in ionic crystals.
Ionic crystals are good conductors of electricity.
The total charge in ionic compounds adds up to the charge of the polyatomic anion.
Alternating layers of positive and negative ions form the ionic crystal.
Discrete molecules do not exist in ionic crystals.
The correct statement about ionic crystals is Alternating layers of positive and negative ions form the ionic crystal.
What are ionic crystals?They are ions bonded by electrostatic attraction into a regular lattice to form solids.
It should be noted that the Ionic compounds are not molecules but crystals however there are many alternating positive and negative ions which are seen to be bounded together in a matrix to form crystals. The positive metal ion of an ionic compound is identified first, and then the negative nonmetal ion. Solids with high melting and boiling points are ionic compounds.
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1. Several solids, liquids, and gases can be found in your home. List three examples of each.
2. What states of matter exist within the human body? What state of matter do you think your body is mostly made up of? Why?
3. Your blood contains many dissolved solids. What do you think could be done if you needed to remove the water from a sample of blood in order to study the solids that remained?
4. Your body contains a considerable amount of dissolved metal ions. Based on what you know about food and nutrition, list at least three metals that you think could be found within the human body?
Examples of 1) solids that can be found in a home are furniture, ceramic or glassware, and books. Liquids are water, juice, and milk. Gases are air, natural gas, and propane.
2)The states of matter that exist within the human body are solid (bones), liquid (blood), and gas (oxygen).
3) If there is a need to remove water from a sample of blood to study the remaining solids, a process called dehydration or desiccation can be employed.
4)Iron, copper, etc. are present which are metals.
The human body contains all three states of matter: solid, liquid, and gas. Solids can be found in various components, such as bones, teeth, and tissues. They provide structural support and protection. Liquids like blood, digestive juices, and other bodily fluids are crucial for transportation, lubrication, and maintaining physiological functions. Gases, such as oxygen and carbon dioxide, are involved in respiration and are exchanged in the lungs.
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hat is the charge of a magnesium ion? +
The charge that we have on the magnesium ion can be seen to be + 2
How do you know the charge on the magnesium ion?By looking at the position of the magnesium ion on the periodic table, it is possible to establish its charge. Magnesium is a metal that is classified in Group 2 of the periodic table, often known as alkaline earth metals.
Having two valence electrons, group 2 metals frequently lose these electrons to create cations with a 2+ charge. Consequently, the magnesium ion has a charge of +2.
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Two scientists were comparing the boiling points of two different substances. They each measured the boiling point of one substance. When they compared data, they found that they had used different temperature scales. The first scientist reported that Substance A boiled at 245 K. The second scientist reported that Substance B boiled at -92°C. Change the measurements to a single temperature scale. Which substance boils at a higher temperature?
Substance A has a higher boiling point compared to Substance B when measured on the same temperature scale.
To compare the boiling points of Substance A and Substance B, which were measured using different temperature scales, we need to convert the temperatures to a single scale for accurate comparison. The boiling point of Substance A was reported as 245 K, and the boiling point of Substance B was reported as -92°C. To convert Substance B's temperature from Celsius to Kelvin, we need to add 273.15 to the Celsius value. Thus, -92°C + 273.15 = 181.15 K. Now, both temperatures are in Kelvin: Substance A boils at 245 K, and Substance B boils at 181.15 K. Comparing the temperatures, we find that Substance A boils at a higher temperature (245 K) than Substance B (181.15 K). Therefore, Substance A has a higher boiling point compared to Substance B when measured on the same temperature scale.
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How many grams of the molecule in the figure below would be
equal to 1 mol of the molecule? (Carbon = 12, Oxygen = 16,
Hydrogen = 1)
A) 29
B) 30
C) 60
D) 150
E) 342
Answer: B
Explanation:
If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 70 days?
Show your work and round your answer to the nearest whole number.
Answer:
approximately 313 grams
Explanation:
After 1 half-life (14 days), the amount of substance remaining is half of the original amount:
10,000 grams / 2 = 5,000 grams
After 2 half-lives (28 days), the amount remaining is half of the amount remaining after 1 half-life:
5,000 grams / 2 = 2,500 grams
After 3 half-lives (42 days), the amount remaining is half of the amount remaining after 2 half-lives:
2,500 grams / 2 = 1,250 grams
After 4 half-lives (56 days), the amount remaining is half of the amount remaining after 3 half-lives:
1,250 grams / 2 = 625 grams
After 5 half-lives (70 days), the amount remaining is half of the amount remaining after 4 half-lives:
625 grams / 2 = 312.5 grams
Rounding to the nearest whole number, you would have approximately 313 grams remaining after 70 days.
sodium carbonate reacts with calcium chloride to produce solid calcium carbonate and sodium chloride.
Write the balanced equation for the roaction
The balanced equation for the reaction between sodium carbonate (Na2CO3) and calcium chloride (CaCl2) to produce solid calcium carbonate (CaCO3) and sodium chloride (NaCl) can be written as follows:
Na2CO3 + CaCl2 -> CaCO3 + 2NaCl
Sodium carbonate (Na2CO3) contains two sodium (Na) ions, one carbonate (CO3) ion, and calcium chloride (CaCl2) contains one calcium (Ca) ion and two chloride (Cl) ions.
To balance the equation, we need to ensure that the number of atoms of each element is equal on both sides.
On the left side, we have:
2 Na atoms (from Na2CO3)
1 C atom (from CO3)
3 O atoms (from CO3)
1 Ca atom (from CaCl2)
2 Cl atoms (from CaCl2)
On the right side, we have:
1 Ca atom (from CaCO3)
1 C atom (from CaCO3)
3 O atoms (from CaCO3)
2 Na atoms (from 2NaCl)
2 Cl atoms (from 2NaCl)
By comparing the number of atoms on both sides, we can balance the equation by adjusting the coefficients. The balanced equation is:
Na2CO3 + CaCl2 -> CaCO3 + 2NaCl
This equation shows that when sodium carbonate and calcium chloride react, they produce solid calcium carbonate and sodium chloride. The coefficients in front of each compound indicate the number of moles or molecules involved in the reaction, ensuring that the law of conservation of mass is upheld.
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Robert Delaunay's Homage to Blériot (1914) was inspired by
O the invention of stroboscopic photography
the construction of the Eiffel Tower
his wife's new dress designs
the first flight across the English channel
Answer:
Robert Delaunay's Homage to Blériot (1914) was inspired by the first flight across the English channel.
a balloon displaces 3473L at sea level what will be the displacement if it flies to an altitude where the atmospheric pressure is 10.82inHg
The displacement of the balloon at an altitude where the atmospheric pressure is 10.82 inHg would be 9,603.7 L
What is the final volume of the balloon?The displacement of a balloon is determined by the volume of air that it displaces.
Apply Boyle's as follows;
V₁P₁ = V₂P₂
V₂ = (V₁P₁) / P₂
Where;
V₁ is the initial displacement of the balloon at sea levelP₁ is the atmospheric pressure at sea level ( 29.92 inHg)P₂ is the atmospheric pressure at the new altitude ( 10.82 inHg)V₂ is the new displacement of the balloon.The final volume is calculated as follows;
V₂ = (3473 x 29.92) / (10.82)
V₂ = 9,603.7 L
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Sulfur hexafluoride (SF) is a gas that, like helium, alters the human voice when inhaled. However, it causes the pitch of the voice to decrease, rather than increase.
At STP, the density of SF, is 6.52g/L
and it will float or sink?
The gas sulfur hexafluoride (SF6) is significantly denser than air. SF6 is about five times denser than air at standard temperature and pressure (STP), where its density is 6.52 g/L, so it will sink.
Why the gas will sinkThe gas sulfur hexafluoride (SF6) is significantly denser than air. SF6 is about five times denser than air at standard temperature and pressure (STP), where its density is 6.52 g/L. At STP, the density of air is roughly 1.2 g/L.
SF6 sinks in air due to its high density. This means that SF6 will gradually descend to the ground and collect in low-lying locations if it is released into the sky.
It's important to remember that SF6 is a strong greenhouse gas with a protracted atmospheric lifespan. Although it has many industrial uses, including electrical insulation, its use is being phased out more and more because of its negative effects on the environment.
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What is the change in enthalpy when 90.6 g
of steam at 100◦C is converted to liquid water
at the same temperature and pressure? The
heat of vaporization of water is 40.7 kJ/mole.
The change in enthalpy when 90.6 g of steam at 100◦C is converted to liquid water at the same temperature and pressure is 204.7 KJ
How do i determine the change in enthalpy?First, we shall obtain the number of mole water converted to steam. details below:
Mass of water = 90.6 grams Molar mass of water = 18 g/mol Mole of water =?Mole = mass / molar mass
Mole of water = 90.6 / 18
Mole of water = 5.03 moles
Finally, we shall determine the change in enthalpy. Details below:
Mole of water (n) = 5.03 molesHeat of vaporization (ΔHv) = 40.7 KJ/molChange in enthalpy (ΔH) =?ΔH = n × ΔHv
ΔH = 5.03 × 40.7
ΔH = 204.7 KJ
Thus, we can conclude that the change in enthalpy is 204.7 KJ
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Strontium-90 is present in radioactive fallout and has a half-life of 28.8 years. The first atomic detonation was at a place called Trinity Site in New Mexico in 1945 - 68 years ago. What percentage of Strontium-90 would remain in the soil at the site?
Round your answer to the nearest 5%. Example: If your answer would be greater than or equal to 32.5%, and less than 37.5%, you would report 35 - do not use a decimal or percent sign (%) after the number.
About 2.5% of Strontium-90 would remain in the soil at the Trinity Site.
Since the half-life of Strontium-90 is 28.8 years, we can use the formula for radioactive decay to calculate the percentage of Strontium-90 that would remain in the soil after 68 years:
Percentage remaining = (1/2)^(68/28.8) x 100
Solving this equation, we get:
Percentage remaining = 2.5%
This means that after 68 years, only 2.5% of the original amount of Strontium-90 would remain in the soil at the Trinity Site. The rest of the Strontium-90 would have decayed into other elements through radioactive decay. It's important to note that Strontium-90 is a dangerous radioactive isotope that can cause cancer and other health problems if ingested or inhaled, so measures should be taken to prevent people from being exposed to it.
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People have developed models of the universe for thousands of years. What are two observations that a model of the universe would need to be explained in order to be useful?
In order for a model of the universe to be useful, it should be able to explain and account for various observations and phenomena such as cosmic microwave background radiation and large scale structure of the universe.
Cosmic microwave background radiation and large scale structure of the universeCosmic Microwave Background Radiation: The existence of the cosmic microwave background radiation (CMB) is one of cosmology's most important observations. The afterglow of the Big Bang is thought to represent this radiation, a weak energy glow that penetrates the entire cosmos. The origin, properties, and dispersion of the CMB should all be explicable by a suitable universe model. It should take into consideration the minor anisotropies (variations) and isotropy (uniformity) seen in the CMB, which are vital for understanding the origins of the universe.
The distribution of galaxies and galaxy clusters on a massive scale is referred to as the largescale structure of the universe, which is another significant observation. We notice that matter is not evenly dispersed throughout the universe, but instead forms a complicated pattern of filaments, voids, and clusters. The evolution of large scale structures, including the mechanisms that created galaxies, galaxy clusters, and the cosmic web, should be explicable by a meaningful universe model. The observed characteristics, such as the concentration of matter and the expansion of space, should also be taken into account.
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Robert Delaunay's Homage to Blériot (1914) was inspired by
O the invention of stroboscopic photography
the construction of the Eiffel Tower
his wife's new dress designs
the first flight across the English channel
Robert Delaunay's Homage to Bleriot (1914) was inspired by the first flight across the English Channel, hence option D is correct.
The Eiffel Tower and airplanes served as symbols of technological advancement throughout the entire piece.
The flight of Bleriot across the English Channel was a noteworthy occasion in Europe. Robert Delaunay's Homage to Bleriot, is the rotation of propellers, the sun, and rose windows in cathedrals are all depicted by the circles.
Delaunay studied at the Ronsin's Atelier in Belleville, where he also spent two years working as a set designer solely for theater productions. He then started exploring with painting after that.
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Having trouble figuring this out
A balanced nuclear equation is shown by the reaction in option B.
What is a balanced nuclear equation?The total number of protons and neutrons on the reactant side of the equation and the total number of protons and neutrons on the product side of the equation are equal in a balanced nuclear equation, which describes a nuclear reaction.
The mass and charge of the reaction in B is a balanced thus it is a balanced nuclear equation. We can see that the reaction is clearly the emission of a beta particles from the sodium atom as shown.
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A gas initially at stop is changed to 248k calculate the final pressure of the gas
The final pressure of the gas is zero, as the gas is initially at rest and remains at rest at a temperature of 248K.
To calculate the final pressure of a gas that is initially at rest and is then changed to a temperature of 248K, we need to know the relationship between pressure, temperature, and volume, which is given by the ideal gas law:
PV = nRT
Since the gas is initially at rest, its initial pressure P1 is zero. We can rearrange the ideal gas law to solve for final pressure P2:
P2 = nRT/V
Thus, the final pressure P2 depends only on absolute temperature T. Plugging in the given temperature of 248K:
[tex]P_2 = (P_1*T_2) / T_1 \\P_2 = 0 * T_2 / T_1 = 0[/tex]
[tex]P2 = 0 * R * 248K / V = 0[/tex]
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What is the molarity of a solution that contains 28.5 g of copper (Il) chloride (CUC|2) in
1.50 L of solution? (Show all work, label all units, and draw a box around your final answer)
The molarity of the solution is 0.299 M, given that it contains 28.5 g of CuCl₂ in 1.50 L of solution.
To find the molarity, using the formula,
Molarity (M) = moles of solute / volume of solution in liters
First, we need to calculate the number of moles of copper (II) chloride in 28.5 g. We can use the molar mass of CuCl₂ to convert the mass to moles,
Molar mass of CuCl₂ = 63.55 g/mol
moles of CuCl₂ = 28.5 g / 63.55 g/mol
moles of CuCl₂ = 0.449 mol
Now we can calculate the molarity using the formula,
Molarity (M) = moles of solute / volume of solution in liters
Molarity (M) = 0.449 mol / 1.50 L
Molarity (M) = 0.299 M (rounded to three significant figures)
Therefore, the molarity of the solution is 0.299 M.
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Which diagram shows the relationship between volume and pressure for a gas at constant temperature?
Pressure and volume have an indirectly proportional relationship
Explanation:Ideal gas laws can help us describe the relationship between different values for gases.
Boyle's Law
The ideal gas law that connects pressure and volume given a constant temperature is Boyle's law. Boyle's law is represented as:
P₁V₁ = P₂V₂This equation shows that pressure and volume have an indirectly proportional relationship. This means that as pressure increases, volume decreases and vice versa. So, pressure and increase opposite of each other.
Indirect Relationships
Indirect relationships occur when one value and the reciprocal of another are proportional. For example, pressure and 1/volume are directly proportional. This function looks like a decreasing exponential function. Attached is an example of a volume vs. pressure graph.
A chemist prepares a solution of mercury(I) chloride by measuring out .000084 umol of mercury(I) chloride into a 50 mL volumetric flask and filling the flask to the mark with water.
Calculate the concentration in mmol/L of the chemist's mercury(I) chloride solution. Be sure your answer has the correct number of significant digits.
The concentration of the mercury(I) chloride solution is [tex]1.68 *[/tex] [tex]10^{-3}[/tex] mmol/L.
To calculate the concentration of the mercury(I) chloride solution, we need to first convert the amount of substance measured in micromoles (umol) to moles.
[tex]0.000084\ umol = 8.4 *[/tex] [tex]10^{-8}[/tex] mol
Next, we need to calculate the volume of the solution in liters:
50 mL = 0.050 L
Finally, we can use the formula for molarity:
Molarity = moles of solute/volume of solution in liters
Molarity = [tex]8.4 * 10^{-8} mol / 0.050 L = 1.68 * 10^{-6} M[/tex]
To convert this to millimoles per liter (mmol/L), we can multiply by 1000:
[tex]1.68 * 10^{-6} M = 1.68 *10^{-3} mmol/L[/tex]
Thus, the concentration of the mercury(I) chloride solution as the dimensions provided in question is [tex]1.68[/tex] x [tex]10^{-3}[/tex] mmol/L.
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Question 1
What is thermal energy
The term "thermal energy" refers to an object's internal energy that results from the movement of its constituent particles. The temperature of the item increases with the amount of kinetic energy these particles possess.
Heat is the thermal energy that is transferred between things when their temperatures differ. Temperature is a measurement of the average kinetic energy of the particles in a substance, and it is connected to the idea of thermal energy.
When two items with different temperatures come in touch with one another, thermal energy will go from the hotter to the cooler object until they achieve thermal equilibrium, when both objects are at the same temperature. Numerous branches of research and technology, such as thermodynamics, energy transmission, and materials science, all heavily rely on thermal energy.
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764
9. The mean weight of a group of 15 athletes was 60 kg. Two athletes whose weights were 68kg and 65 kg left the group
What is the new mean weight of the remaining athletes in the group?
The new mean weight of the remaining athletes in the group is approximately 59 kg.
To find the new mean weight of the remaining athletes in the group, we need to subtract the weights of the two athletes who left the group from the total weight of the group, and then divide by the number of remaining athletes.
First, we need to find the total weight of the group before the two athletes left:
Total weight = mean weight * number of athletes
Total weight = 60 kg * 15 athletes
Total weight = 900 kg
Next, we subtract the weights of the two athletes who left:
New total weight = 900 kg - 68 kg - 65 kg
New total weight = 767 kg
We also need to subtract the number of athletes who left from the total number of athletes:
New number of athletes = 15 athletes - 2 athletes
New number of athletes = 13 athletes
Finally, we can find the new mean weight:
New mean weight = New total weight / New number of athletes
New mean weight = 767 kg / 13 athletes
New mean weight ≈ 59 kg
Therefore, the new mean weight of the remaining athletes in the group is approximately 59 kg.
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If each ml of a solution of H2PO3 contains the equivalent of 0.5000 M of dissolved P2O5, what vol. of 2.50 M NaOH would be required to react with 20.0 ml of the acid to form HPO4?
Answer:
Thought the basicity of h3p04 is greater than h3p03, it doesn't mean that it's acidic strength is greater..Like a person who has lots of money doesn't mean that he is giving…
According to the above rule mentioned…h3po4 has 1 oxygen bonded atom and 3 OH- groups so ratio is 1/3
Similarly h3p03 has 1 double bonded oxygen and 2 OH- groups so ratio is 1/2
Since 1/2 > 1/3 …h3po3 has more acidic strength
But if we look other oxyacids of phosphorus
The trend would be HPO3 > H3PO2 > H3PO3 > H3PO4 (check the structures )
The density of a sample of NH3(g) at a pressure of 1.00 atm is 0.869 g/L. What is the square velocity (in m/s) of the molecules in this sample?
The density of a sample of NH[tex]_3[/tex](g) at a pressure of 1.00 atm is 0.869 g/L. 592m/s is the square velocity (in m/s) of the molecules in this sample.
The velocity of a gas molecule at a certain temperature, which corresponds to point P in the graph, is 200 ms. At the given temperature, the rms velocity of a gas molecule is about. Molecular count (A) 163ms (C) 245ms (B) 217 milliseconds; (D) 226 milliseconds. The rms velocity of a particular amount of gas molecules at 27oC and 1.0 105 Nm⁻² pressure is 200 msec-1.
velocity = √3p/density
=√3/0.869
=592m/s
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From the graph, if a solution contains 80 g of potassium
chloride per 100 g of water at 10°C, the solution is said to be
It is claimed that the solution is saturated. This is due to the graph's indication that potassium chloride dissolves 80g/100g in water at 10°C. The solution is referred to as being saturated when the solute concentration equals its solubility.
When the solution can no longer dissolve the solute, saturation takes place. This is because the solution has achieved its maximum solubility and the solute particles are too big to dissolve in the solvent.
The solution is considered to be saturated at this stage. Given that potassium chloride dissolves 80g/100g in water at 10°C in the graph, the solution is saturated.
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10th grade chemistry. I’m so confused on what I need to do. What do I draw?
In chemistry, drawing chemical structures is a fundamental skill that allows us to communicate and understand chemical concepts.
A chemical structure is a diagram of a molecule or compound that depicts the arrangement of atoms as well as the chemical bonds that hold them together. Depending on the complexity of the molecule and the level of detail required, there are various methods for drawing chemical structures. Lewis structures, line structures, and condensed structures are the most prevalent types of chemical structures.Lewis structures are diagrams that depict a molecule's valence electrons and bonding patterns. To create a Lewis structure, you must first determine how many valence electrons each atom has and then use them to form bonds and fill octets.
When designing Lewis structures, you should additionally consider formal charges, resonance, and electronegativity.Line structures are a method of depicting molecules that is simplified by the use of lines to represent bonds and atoms. In line structures, each vertex or endpoint represents a carbon atom unless otherwise indicated. Hydrogen atoms are not usually shown unless they are attached to a heteroatom. Line structures are useful for quickly drawing and comparing structures, but they do not show the three-dimensional arrangement of atoms.Condensed structures are another way of representing molecules by using symbols and abbreviations to represent atoms and functional groups. In condensed structures, bonds are implied rather than drawn, and atoms are listed in the order of their connectivity.
Condensed structures are useful for representing large and complex molecules, but they can be ambiguous and difficult to read without practice.
Overall, drawing chemical structures is an essential skill in chemistry that requires practice and attention to detail. By learning how to draw Lewis structures, line structures, and condensed structures, you can better understand chemical concepts and communicate your ideas to others.
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You are a nurse and you have several patients that need treatment. Thank goodness you were taught how to manipulate gas laws in order to help the patients. Help each patient solve the issue they are encountering. Patient C needs oxygen administered due to difficulty breathing. Check how many mols of gas is in a cylinder that has a volume of 5L at 13700 kPa, at atmospheric pressure and room temperature at 20 degrees Celsius.
There are 2.49 moles of gas in the cylinder, which can be used to administer oxygen to a patient who is experiencing difficulty breathing.
The ideal gas law is PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
To use this equation, we need to convert the temperature from Celsius to Kelvin by adding 273.15. The atmospheric pressure is 101.3 kPa. Once we have all the variables, we can rearrange the equation to solve for n, the number of moles of gas in the cylinder.
n = PV/RT
Plugging in the given values, we get:
[tex]n = (13700 kPa * 5 L) / (8.314 J/mol*K * (20+273.15) K) \\n = 2.49 mol[/tex]
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What is the structure for (CH3)2CHCH2CH(CH3)CH3?
The structure of the compound (CH₃)₂CHCH₂CH(CH₃)₂ (2,4-Dimethylpentane) is shown in the attached image.
What is 2,4-Dimethylpentane?The compound (CH₃)₂CHCH₂CH(CH₃)₂ is a 2,4-Dimethylpentane.
Iso-octanes or 2,4-Dimethylpentanes have unique qualities that make them ideal tools for measuring gasoline quality. They are hydrocarbon compounds made up of carbon and hydrogen atoms [C7H16] that belong to the class of alkanes.
Clear in color and highly volatile yet stable under typical conditions makes them excellent references for determining gasoline performance via octane ratings.
Interestingly enough, they happen to be one of several structural isomers found within hydrocarbons like octanes which themselves contain several representative molecules at positions along the chain.
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Correct question:
What is the structure for (CH3)2CHCH2CH(CH3)2?
how many electrons are in the third energy level of diagram 4
After the third energy level has 8 electrons (argon), the next 2 electrons go into the fourth energy level.
Explanation:
In order the atom to be stable the 3 energy level should carry only 8 electrons but 3 energy level can carry up to 18 electrons
The mass of an evacuated 265 mL flask is
143.147 g. The mass of the flask filled with 271
torr of an unknown gas at 30 °C is 144.247 g
Calculate the molar mass of the unknown gas.
The molar mass of the unknown gas is 228.5 g/mol.
Given:
Volume = 265 mL
Mass = 143.147 g
Temperature = 30 °C
1 atm = 760 torr
271 torr = 0.356 atm
Use the ideal gas law:
PV = nRT
where P is the pressure of the gas, V is the volume of the flask, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas in Kelvin.
n = PV/RT
n = (0.356 atm)(0.265 L) / (0.08206 L·atm/mol·K)(303.15 K)
n = 0.00481 mol
Calculate the mass of the gas:
Mass = total mass - flask mass
Mass = 144.247 g - 143.147 g
Mass = 1.1 g
Calculate the molar mass of the gas:
Molar mass = mass / n
Molar mass = 1.1 g / 0.00481 mol
Molar mass = 228.5 g/mol
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