Answer:
i got 12.1 as my answer hope it is right
The the volume that 0.540 mol of propane (C3H8) occupies at STP is 12.1 l.
What is volume ?Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.
The molar volume (Vm) is the volume occupied by one mole of a chemical element or chemical compound at standard temperature and pressure (STP). You may figure it out by dividing the mass density () by the molar mass (M).
From the ideal gas law; V = nRT/ P
where,
n = 0.540 mol
universal gas constant R = 8.314 J/mol·K
standard temperature T = 273.15 K
standard pressure P = 101 325 Pa
Substituting the values into the formula ;
= 0.540 × 8.314 × 273.15 / 101.325
= 0.0121 m³
= 12.1 l
Thus, The the volume that 0.540 mol of propane (C3H8) occupies at STP is 12.1 l.
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give me the type of reactions ___ CuCO3 → ___ CuO + ___ CO2
An atom of element X has an atomic number of 11 and a mass number of 23. .
a) What is the definition of atomic number?
b) How many protons, electrons and neutrons are in this atom?
c) A different atom of X has an atomic number of 11, but a mass number of 24. Give a
name for these two forms of X.
d) Would these two atoms have similar chemical properties? Give a reason for your
answer.
Answer:
ssaasasasassdsdsdafdftrga*b*y/a la 3
Explanation:
Answer:
a) the number of protons in an atom
b) 11 protons, 11 electrons and 12 neutrons.
c) Isotope
d) yes, they still have the same number of protons and electrons.
Explanation:
b) Number of neutrons = mass number - atomic number
Atoms have the same number of electrons and protons
c) isotopes are atoms with the same number of protons but a different number of neutrons.
Hope this helped !
how to balance _h2s+ _o2 = _h2o+ _s
Answer:
2H₂S + 1O₂ → 2H₂O + 2S
Explanation:
SOLUTION :-
Balance it by using 'hit & trial' method , and you'll get the answer :-
2H₂S + 1O₂ → 2H₂O + 2S
VERIFICATION :-
In reactant side of equation :-
Number of atoms in H = 2×2 = 4Number of atoms in S = 2×1 = 2Number of atoms in O = 1×2 = 2In product side of equation :-
Number of atoms in H = 2×2 = 4Number of atoms in O = 2×1 = 2Number of atoms in S = 2×1 = 2Number of atoms of each element is equal in both reactant & product side of equation. Hence , the equation is balanced.
How could the amount of ice cover at the poles be indirectly affected by an increase in evaporation near the equator? Explain.
Answer:
The factors that determine the extent of the ice cover at the poles are the temperature, the winds and the ocean currents. The Artic Ocean sea ice cover is observed to change more in response to a changes in temperature while the Antarctic sea ice cover change more with changes in the wind and ocean currents
Increased evaporation at the equator will come about as a result of rising temperatures combined with the high temperatures of the summer can result in a reduction in the amount of ice cover in the North pole oceans, while the high evaporation rate can lead to higher ocean water circulation rate between North and South poles and the equator such that the ice cover in Antarctica
Therefore, an increase in evaporation near the equator will decrease the ice cover at the poles
Explanation:
How many atoms are in 5.9 g of N2?
Answer:
Number of atoms in 5.9 g of N2 = 1.268 *10^23
Explanation:
Weight of one mole of N2 is 28.0134 g
In one mole of N2, number of atoms = 6.023 *10^23
Number of atoms in 28.0134 g (one mole) of N2 = 6.023 *10^23
Number of atoms in 1 g of N2 = 6.023 *10^23/28.0134
Number of atoms in 5.9 g of N2 = 6.023 *10^23/28.0134 * 5.9
= 1.268 *10^23
Which describes the greatest difference between gases and solids?
A. Solids feel softer than gases.
B. Gases are darker colors than solids.
c. Solids have stronger odors than gases.
D. Gases usually weigh less than solids.
Answer:
D)Gases usually weigh less than solids.
Answer:
D) Gases usually weigh less than solids
Explanation:
Gases don't have weight and solids do which automatically makes gases lighter because they don't have a mass like a solid.
How is stoichiometry used to calculate energy absorbed when a mass of
solid melts?
O A. Grams solid x mol/g * A Hreaction
B. Grams solid x mol/g * A Hp
C. Grams solid x mol/g * A Hfusion
O D. Grams solid x mol/g * A Hvap
Answer: Option C is correct
Grams solid x mol/g * A Hfusion
Explanation:
This is because from fusion is associated to melting and this is a process where solid particles or substances goes through transition phase and turn to liquid.
There for the stoichiometry is used to calculate energy absorbed when solid mass melt with the formula Grams solid x mol/g * A Hfusion.
Is Zinc sulfide ionic or covalent?
HELP ASAP!
Which statement describes one way that nuclear fission differs from nuclear
fusion?
Answer:
answer is A- nuclear fission is too hard to control for use in practical applications
Answer:
O C. Nuclear fission is used to produce electrical power.
Explanation:
If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?
Answer: As a result an increase in kinetic energy also happens.
Explanation:
Potential energy is the energy occupied by an object or substance due to its position.
Kinetic energy is the energy occupied by an object of substance due to its motion.
If the kinetic and potential energy in a system are equal and then an increase in potential energy will occur.
As a result, there will also occur an increase in kinetic energy also.
Thus, we can conclude that as a result an increase in kinetic energy also happens.
What is a jet stream. in your own words but be more detailed about what you say.
(don't send a link)
down there (pls hurry!!)
During a combustion reaction, 9.00 grams of oxygen reacted with 3.00 grams of CH4.
What is the amount of the leftover reactant?
0.74 grams of methane
0.89 grams of methane
1.22 grams of oxygen
1.45 grams of oxygen
Answer:
0.74
Explanation:
this is the correct answer. I followed a correct answer that had the same probelm with different values, swithxed it with mine, and got 0.75. So its basically 0.74
What change would shift the equilibrium system to the left?
A(g) + B(s) + Energy = 309) (3 points)
Adding more of gas C to the system
Heating the system
Increasing the volume
Removing some of gas C from the system
Answer:
C
Explanation:
sorry if its wrong but i think its right
Heating the system will shift the equilibrium system to the left.
The correct option is B.
What is equilibrium?
Chemical equilibrium is a state where no net change in the amounts of reactants and the products occurs during a reversible chemical reaction.
A reversible chemical reaction happens when the products react with the original reactants as soon as they are generated.
On a treadmill, you are walking continuously but not going anywhere, which can be said as equilibrium.
Thus, the correct option is B.
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When 0.875 g. of magnesium was heated in air, 1.25 g. of magnesium oxide
(MgO) was produced. How much oxygen must be added?
Answer:
1. What is the coefficient for calcium in the balanced equation?
2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2
2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must
write the equation, balance it and solve the mass-mass problem.
a. Balanced equation:
2 C2H2 + 5 O2 4 CO2 + 2 H2O
Explanation:
If some salt were accidently spilled as it was transferred from the balance to the cup would your calculated enthalpy of solution of the salt be too high or too low
Answer:
It would be to low
Explanation:
If some salt were accidently spilled as it was transferred from balance to cup calculated enthalpy of solution of salt be too low as there will be loss in mass which would lead less solubility of salt and hence less enthalpy.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Answer is D
Relatively slow rates of chemical reaction are associated with which characteristic?
A)
High temperature
B)
Low activation energy
C).
The presence of a catalyst
D)
Strong bonds in reactant molecules
Option D : Strong bonds in reactant molecules
The strong bonds in reactant molecules sometimes needs extra energy to weaken the bond and proceed the reaction. Hence, option D is correct.
What is reaction rate ?The rate of a reaction is the rate of decrease in concentration of the reactants or decrease in concentration of the reactants or increase in the concentration of the products.
The minimum energy required to overcome the barrier potential of a reaction is called its activation energy. Hence, lower the activation energy higher will be the reaction rate.
High temperature and presence of catalyst also leads to higher rate. Strong bonds in reactants needs higher energy to weaken the intermolecular force. Thus, slower the reaction rate.
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Can magic 8 ball wash with water?
If an amine functional group is added to an organic compound, the name of the compound will begin with
Answer for a apple it would be happle
xplanation:
How many joules of heat are needed to raise the temperature of 62.0 g of ethylene glycol from 13.1 C to 40.5C?
Answer:
Q = 4133.2 J
Explanation:
Hello there!
In this case, since these calorimetry problems are based off the following heat equation involving heat (Q), mass (m), specific heat (C) and temperatures (T):
[tex]Q=mC(T_2-T_1)[/tex]
Thus, we plug in the given variables to obtain:
[tex]Q=62.0 g*2.433 \frac{J}{g\°C}* (40.5\°C-13.1\°C)\\\\Q=4133.2J[/tex]
Regards!
help me please this is chemistry
Balance the following equations.
Answer:
A) Mg + H2SO4 → MgSO4 + H2
B) CaCO3 + 2HCl → CaCl2 + H2O + CO2
C) CaO + H2O → Ca(OH)2
D) 3Ag + 4HNO3 → 3AgNO3 + H2O + NO2
Explanation:
A) Mg + H2SO4 → MgSO4 + H2
The equation is already balanced because the number of each element in the left hand side is already equal to that in the right hand side.
B) CaCO3 + 2HCl → CaCl2 + H2O + CO2
This equation is balanced by putting 2 in front of HCl on the left hand side to balance the elements on the right hand side.
C) CaO + H2O → Ca(OH)2
Thus equation is already balanced because the number of each element in the left hand side is already equal to that in the right hand side.
D) 3Ag + 4HNO3 → 3AgNO3 + H2O + NO2
This equation is balanced by putting 3 in front of Ag and 4 in front of HNO3 on the left hand side while we put 3 in front of AgNO3 on the right side to balance the elements on the right hand side.
Calculate the number of moles of oxygen (O2) in 24.0 g of O2?
Number of moles = mass/ molar mass
it implies that n(O2) = 24.0g / 32
= 0.75 mols
How much of a 10 M solution is needed to make 1 liter of a 1M solution?
a. 1ml
b. 1000ml
c. 10ml
d. 100ml
i dont know I hope someone knows soon take care
According to molar concentration, 100 ml of 10 M solution is needed to make 1 liter of a 1 M solution.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case of two solutions, molar concentration is found out by, M₁V₁=M₂V₂.
On substitution in above formula, V₁=1×1/10=0.1 L=100 ml.
Thus, 100 ml of a 10 M solution is needed to make 1 liter of a 1 M solution.
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How would the number of atoms in a 2.02g sample of hydrogen compare to the number of atoms in a 32.00g sample of oxygen
Answer:
Number of atoms is equal.
Explanation:
1 mol of anything contains NA particles.
NA is known as Avogadro's number, 6.02×10²³
We determined the moles of each compound. Both molecules are dyatomic,
H₂ → 2.02 g . 1mol / 2.016 g = 1 mol
O₂ → 32 g . 1mol / 32g = 1 mol
Both have the same amount of moles.
In conclussion, the number of atoms is the same in both samples.
2. If the half-life of Francium-233 is 22 minutes, how much time must elapse in order for 60 grams of a 64 gram
sample to undergo decay? In other words, after how many minutes will you only have 4 grams of the original isotope
remaining?
Answer:
88 minutes
Explanation:
64 g ---> 32g ---> 16g ---> 8 g ---> 4 g
So in total, we have 4 half lives to reach 4.0 g
therefore, 4 x 22 minutes = 88 minutes
88 minutes or four half lives are required to have 4 grams of the original isotope remaining.
What is half life?Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.
During first half life= 64 g of isotope is present , during second half life 1/2×64=32 g of isotope is present, during third half life 1/2×32=16 g of isotope is present.during fourth half life 1/2×16=8 g of isotope is present.
As 1 half life is 22 minutes 4 half lives=4×22=88 minutes.
Thus, 88 minutes are requires for 4 g of sample to remain.
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2
A chart with the densities of four metals is shown.
Metal
Density (gicm')
Titanium
4.5
Zinc
7.1
Nickel
88
Silver
10.5
Students were given a sample of an unknown metal and told to determine
its density. They measured its mass as 26.4 g and its volume as 3.0 cm?
Use the chart to determine which metal the students were given.
Answer:
mass(m)=26.4g
volume (v)=3.0cm²
we have
density =m/v=26.4/3=8.8g/cm³
since it is equal to density of nickel.
Option C nickel is a required answer.
Answer:
[tex]\huge\boxed{\fcolorbox{green}{yellow}{option \: \: c}}[/tex]
Find the total pressure (in atm) of a mixture that contains 3 gases with the following partial pressures. Gas A is 4.2atm, Gas B is 780 mmHg, Gas C is 250.00kPa
Answer: The total pressure of given mixture that contains 3 gases is 7.68 atm.
Explanation:
Given: Partial pressure of gases is:
Gas A = 4.2 atm
Gas B = 780 mm Hg
Convert mm Hg into atm is as follows.
[tex]1 mm Hg = 0.00131579 atm\\780 mm Hg = 780 mm Hg \times \frac{0.00131579 atm}{1 mm Hg}\\= 1.02 atm[/tex]
Gas C = 250 kPa
Convert kPa into atm as follows.
[tex]1 kPa = 0.00986923 atm\\250 kPa = 250 kPa \times \frac{0.00986923 atm}{1 kPa}\\= 2.46 atm[/tex]
Total pressure is the sum of partial pressures of gases present in the mixture.
Therefore, total pressure of given mixture is calculated as follows.
[tex]P_{total} = P_{A} + P_{B} + P_{C}\\= 4.2 atm + 1.02 atm + 2.46 atm\\= 7.68 atm[/tex]
Thus, we can conclude that the total pressure of given mixture that contains 3 gases is 7.68 atm.
Consider an ideal gas contained in a cylinder with the volume 34.4L, temperature 667K and pressure 2atm.What will be pressure of the gas if it is heated at 1000k and the volume becomes 50L.
Given :
An ideal gas contained in a cylinder with the volume 34.4L, temperature 667K and pressure 2 atm.
To Find :
What will be pressure of the gas if it is heated at 1000k and the volume becomes 50L.
Solution :
We know, by ideal gas equation :
[tex]Pv = nRT[/tex]
Now, in the given question only their are two state and also their is no leakage so amount of gas is also constant.
So,
[tex]\dfrac{P_1V_1}{T_1} = \dfrac{P_2V_2}{T_2}\\\\\dfrac{2\times 34.4}{667} = \dfrac{P_2 \times 50}{1000}\\\\P_2 = \dfrac{2\times 34.4 \times 1000}{667 \times 50}\ atm\\\\P_2 = 2.06 \ atm[/tex]
Therefore, the pressure of gas is 2.06 atm.
2 H2(g) + O2 (g) --> 2 H20 (1)
How many moles of hydrogen gas do you need to make 2 moles of liquid water?
Answer:
4moles of hydrogen atoms
Explanation:
The second conversion factor reflects the number of atoms contained within each molecule. Two water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.