Answer:
[tex]\boxed {\boxed {\sf 3.94 *10^{23} \ molecules \ C_6 H_ {14} }}}[/tex]
Explanation:
1 mole of any substance has the same number of particles: 6.022 * 10²³. This number is as Avogadro's Number.
The particles can be molecules, atoms, formula units, etc. For this problem, the particles are molecules of C₆H₁₄ or hexane.
We can set up a ratio using Avogadro's Number.
[tex]\frac {6.022 *10^{23} \ molecules \ C_6H_{14}}{1 \ mol \ C_6H_{14}}[/tex]
Multiply by the given number of moles: 0.655
[tex]0.655 \ mol \ C_6H_{14} * \frac {6.022 *10^{23} \ molecules \ C_6H_{14}}{1 \ mol \ C_6H_{14}}[/tex]
The moles of hexane will cancel, because one is the "numerator" (techincally 0.655 is over 1) and the other is in the denominator of the ratio.
[tex]0.655 * \frac {6.022 *10^{23} \ molecules \ C_6H_{14}}{1 }[/tex]
[tex]0.655 * {6.022 *10^{23} \ molecules \ C_6H_{14}}[/tex]
[tex]3.94441*10^{23} \ molecules C_6H_{14}[/tex]
The original value of moles has three significant figures, so our answer must have the same. For the number we found, that is the hundredth place.
3.94441The 4 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]3.94 *10^{23} \ molecules \ C_6H_{14}[/tex]
0.655 moles of hexane is equal to approximately 3.94 *10²³ molecules of hexane.
2Fe2O3 + C → Fe + 3CO2 You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2?
A hot air balloon has a volume of 2,510,000L at a pressure of 105 kPa and 122 degrees Celcius. If the balloon increased to 2,600,000L and the temperature increased to 150 degrees Celcius, what would be the pressure of the balloon?
Answer: The new pressure of the balloon is 108 kPa
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 105 kPa
[tex]P_2[/tex] = final pressure of gas = ?
[tex]V_1[/tex] = initial volume of gas = 2510000 L
[tex]V_2[/tex] = final volume of gas = 2600000 L
[tex]T_1[/tex] = initial temperature of gas = [tex]122^0C=(122+273)K=395K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]150^0C=(150+273)K=423K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{105\times 2510000}{395}=\frac{P_2\times 2600000}{423}[/tex]
[tex]P_2=108kPa[/tex]
The new pressure of the balloon is 108 kPa
47.9 ml hrdrogen is collected at 26° Celsius and 718 torr. Find the volume occupied at STP
Answer:
The volume at STP is 41.3mL
Explanation:
To solve this question we must find the volume using the combined gas law. The equation is:
P1V1 / T1 = P2V2 / T2
Where P is pressure, V volume and T absolute temperature of 1, initial state and 2, final state of the gas.
P1 = 718torr
V1 = 47.9mL
T1 = 26°C + 273.15 = 299.15K
P2 = 760torr at STP
V2 = ?
T2 = 273.15K at STP
Replacing:
718torr*47.9mL / 299.15K = 760torr*V2 / 273.15K
41.3mL = V2
The volume at STP is 41.3mL
How do we see the color violet
Answer:
Violet is scattered most by Earth's atmosphere, but the blue cones in our eyes aren't as sensitive to it. While our red cones aren't good at seeing blue or violet light, they are a bit more sensitive to violet than our green cones.
Explanation:
Predict the reactivity of beryllium compared with magnesium give a reason for your answer use the periodic table
Answer:
Beryllium metal is relatively unreactive at room temperature, particularly in its massive form. Magnesium is more electropositive than the amphoteric beryllium and reacts more readily with most of the nonmetals.
Explanation:
When it comes to the ease with which a positive ion or cation of the metal can form, beryllium is less reactive than magnesium.
What is magnesium ?The chemical element magnesium has the atomic number 12 and the letter Mg as its symbol. It is a glossy, gray metal with a low melting point, high chemical reactivity, and a low density. It only naturally occurs in mixtures with other elements, just like the other alkaline earth metals, and it almost always has an oxidation state of +2.
At room temperature, beryllium metal is largely non-reactive, especially in its massive form. Magnesium interacts more quickly with the majority of nonmetals because it is more electropositive than amphoteric beryllium.
Due to the electron being removed being in the 3-level rather than the 2-level and being further away from the nucleus's attraction, the first ionization energy of magnesium is lower than that of beryllium.
Thus, When it comes to the ease with which a positive ion or cation of the metal can form, beryllium is less reactive than magnesium.
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It was believed that Earth was a stationary object at the center of the universe. All other objects in space were thought
to go around Earth. Which of these is a criticism of this idea?
A)
Years on Earth are regular periods of three hundred sixty five days each
B)
Earth's shadow falling on the moon shows that Earth is actually spherical,
rather than flat
The moon goes around Earth, resulting in different phases of the moon
that can be seen from Earth
D
There are four seasons on Earth only because Earth is tilted at its axis and
it goes around the sun
Answer: A) years on Earth are regular periods of three hundred sixty five days each
The criticism of the given idea is that there are four seasons on Earth only because Earth is tilted at its axis and it goes around the sun.
What are seasons?A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region. On Earth, seasons are the result of the axial parallelism of Earth's tilted orbit around the Sun. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to undergo hibernation or to migrate, and plants to be dormant.
The Northern Hemisphere experiences most direct sunlight during May, June, and July, as the hemisphere faces the Sun. The same is true of the Southern Hemisphere in November, December, and January. It is Earth's axial tilt that causes the Sun to be higher in the sky during the summer months, which increases the solar flux.
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what is the heating curve on the horizontal line
Answer:
The plateaus or horizontal lines on the graph represent the transition between states of the sample. The first plateau represents the melting (or transition from solid to liquid) and the second plateau represents boiling (or transition from liquid to gas).
Explanation:
Why are detergents bad for the environment?
Answer: They are pollutants when they encourage bacterial growth and loss of oxygen in our rivers and streams, they can be the cause of a very unhealthy ecosystem :( kinda sucks tbh
Explanation:
Examine the model of a metallic bond.
What do the smaller circles represent?
o the cations held in place by the attractive forces within the sea of electrons
O the delocalized electrons that are free to move around the positive cations
the distinct and rigid bond between the different metal atoms
the unshared pairs of electrons of the metal atoms involved in the metallic bond
Answer:
b the delocalized
Explanation:
it could be the right answer
Which material would take the longest to cool off once heated?
Liquid water
Lead
Ice
Copper
Answer:
Liquid water
At 390 K, the pressure of a sample of nitrogen is 2.07 atm. What will the
pressure be at 480 K
Answer:
190k 100 on the test
Explanation:
Question #1: Identify the type of Mutation below
Original
TTCGATA
TTGATA
Copy
Insertion
Substitution
Deletion
Answer:
Deletion
Explanation:
A mutation refers to a change in the DNA sequence. This means that the original sequence of bases in the DNA has been altered permanently.
There are three types of DNA mutations; base substitutions, deletions and insertions.
In the particular case of this question, the original is TTCGATA while the copy is TTGATA. If you look closely at the two, you will notice that the C has been omitted. This is an example of deletion.
What is the molarity of a solution which contains 0.80 mol of HCl in 250mL of
solution?
Answer:
3.2M HCl Solution
Explanation:
Molarity = moles of solute / volume of solution expressed in liters
moles of solute = 0.80 moles HCl
volume of solution = 250 ml = 0.250 Liter
Molarity (M) = 0.80 moles HCl / 0.250 Liters = 3.2M HCl Solution
Which of the selections completes the following nuclear reaction?
Answer:
najsbsbsmnshzhskwjzhhsbsbsbsbzbbsnzn
hsnznzkskzjbxbs
gasjhsjsbabakjahajakqjahsvhwksbxbwhsjkxjsjshshshshshhshshshsjshxhsbsbsbsbhshshdbdbbdbdbdhbsjajshshshsjsksksjsjsjjsbsksshshssgsgsbsbvsgsbsjsksjsjxjxjksksjgshkajahsgshsjsjabavsvshwhsggehsjsjsjdnsjajs
Answer:
uhh the Neutron i guess lol you didn't give any choices or explanation
Explanation:
how many liters would you need to make a 1 M solution if you have 6 mol of Sodium Hydroxide
a. 3
b. 4
c. 6
d. 2
One mole of NaOH = 40g NaOH
One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in water
One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in wateraccording to the given data,
One mole of NaOH = 40g NaOHso to prepare 1M NaOH we need to dissolve 40g NaOH in wateraccording to the given data,we have 6 moles of NaOH so we need 6 litres of Water olto prepare 1M Solution
What best explains the reason Jeff sees a double image of the trees on the water
Answer:
Nerve or muscle damage in the eye might cause double vision. Each eye creates its own image of the environment. The brain combines the representations from each eye and perceives them as one clear picture. Damage to the muscles that move the eyes or the nerves that control eye movement can create a double image.
Explanation:
Cheryl kept a potted plant near a window. After two days, she observed that the plant had drooped as shown.
What would most likely help the plant to become healthy
PLEASE HELP!!!!!!!!!!!!!!!!!!! You will recieve 25 points if you help me.
A. watering the plant
B. adding more soil to the pot
C. replanting the plant in a larger pot
D. providing more sunlight to the plant
An unknown gas has pressure, volume and temperature of 0.9 atm 8L and 120°C respectively. How many moles of gas are present?
Answer:
n = 0.223 mol.
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to approach this problem via the ideal gas law, which involves the pressure, moles, temperature and volume of the gas:
[tex]PV=nRT\\\\[/tex]
Thus, by solving for moles we obtain:
[tex]n=\frac{PV}{RT}[/tex]
Therefore, we plug in the given volume, temperature (in Kelvins) and pressure to obtain:
[tex]n=\frac{0.9atm*8L}{0.08206\frac{atm*L}{mol*K}*(120+273)K} \\\\n=0.223mol[/tex]
Best regards!
Convert 230 centimeters into yards
It would be 2.515 yards. This is because to convert cm into yards, you would need to divide the length value by 91.44 so in your case, it would be 230÷ 91.44 which equals 2.51531.
Hope that helps!
Students investigating chemical reactions conducted the experiment you see here. An antacid tablet was dropped into a plastic bag containing 10 ml distilled water at 22oC. The bag was immediately zipped closed and the chemical reaction proceeded until completion. Based on your knowledge of chemical reactions, choose all of the statements below would apply?
A) the tablet completely disappeared.
B) The total mass at the completion of the experiment is 16.72g.
C) The mass of the products is slightly less than the mass of the reactants.
D) A decrease in the mass of the products in the result of the production of a gas.
E) Evidence of a chemical reaction includes the production of something new: a gas
Answer: B and E
Explanation:
The chemical reactions are all around us. Here for the given reaction the tablet completely disappeared and evidence of a chemical reaction includes the production of something new: a gas. The correct options are A and E.
A chemical reaction is defined as the reaction in which the bonds are broken within the reactant molecules and the new bonds are formed within the product molecules. In a chemical reaction the compounds interact to form new substances called products.
In a chemical reaction, a chemical change must occur which is generally observed with precipitation, heat formation, etc.
Thus the correct statements are options A and E.
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(b) Why is nitrogen used for storage of semen
in artificial insemination?
What is the relationship between density and speed of light?
Answer:
The more optically dense that a material is, the slower that a wave will move through the material. ... So as the index of refraction value increases, the optical density increases, and the speed of light in that material decreases.
What pressure will be needed to reduce the volume of 77.4 L of helium at 98.0kPa to a volume of 60.0L?
Answer:
126 kPaExplanation:
The final pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we're finding the final pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
98 kPa = 98,000 Pa
We have
[tex]P_2 = \frac{98000 \times 77.4}{60} = \frac{7585200}{60} \\ = 126420[/tex]
We have the final answer as
126 kPaHope this helps you
is part of the digestive and the respiratory system because food and air can travel 3. The through it.
OLungs
O Heart
O Pharynx
O Diaphragm
Help me!!!
Answer:
pharynx
Explanation:
How is ice cream made???? Hurry plsss!!!
Answer:
Milk, cream, milk solids, sugars, modifying agents and flavourings are blended together in stainless steel vats.
The mix is homogenised to create a consistent texture.
The mix is pasteurised by heating at 82-85°C for 15 seconds then cooled to destroy bacteria.
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An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom's nucleus?
A single proton has the charge of +1.
A neutron is neutral and has a charge of 0
A single electron has the charge of -1
Since the nucleus contains both protons and neutrons, with neutrons have charge of 0 and protons with +1, the total charge of the nucleus would be 25 * 1 which is +25.
Answer:
25+
Explanation:
25+ = the number of protons in the nucleus
URGENT PLEASEEEE HELP
A functional group is a specific arrangement of atoms in an organic compound that is capable of characteristic reactions
Is this true of false
PLEASE HELPP NO LINKSS
Answer:
True
Explanation:
Write a sentence or mathematical expression that relates each of the
following:
-mass to moles
-moles to mass
-moles to particles
-particles to moles
Answer:
Mass to moles: mass/molar mass=mole
Moles to mass: moles x molar mass = mass
Moles to particles:1mole = 6.022x10^23 particles
Particles to moles: 1 particle =1/(6.022x10^23) mole
Explanation:
For the reaction 2Na + 2H20 - 2NaOH + H2, what type of reaction is taking place?
O synthesis
O decomposition
O single replacement
O double replacement
La siguiente ilustración muestra un purificador de agua que utiliza energía solar.
———————————————
Cuál de las siguientes especificaciones es una limitación del sueño del purificador de agua solar?
Answer:
Requiere que el agua pase por membranas de filtración.
Explanation:
Un purificador de agua que utiliza energía solar es un dispositivo innovador y tecnológico que funciona como una estación de saneamiento básico con capacidad para purificar el agua y eliminar el 99% de virus y bacterias.
El sistema funciona de la siguiente manera: cuenta con bomba, panel solar, cargador y mangueras. La bomba mueve el agua a través del filtro utilizando la energía de la batería que se carga con la energía de la luz solar. Incluso en días con poca exposición al sol, el sistema es capaz de utilizar la energía acumulada de la batería y purificar 1 litro de agua en 1 minuto.
Se trata de una tecnología simple e innovadora que puede ser de gran ayuda en el saneamiento básico de lugares que no contienen agua potable, debido a la facilidad y portabilidad del sistema.