Question

A) A syringe containing 1.25 mL of oxygen gas is cooled from
90.3 ∘C to 0.9 ∘C. What is the final volume *V*f of oxygen
gas?

B) What is its volume after an additional 0.30 mol of gas is added to the cylinder? (Assume constant temperature and pressure.) Express your answer to three significant figures.

C) What is the pressure in a 12.9 L cylinder filled with 0.425 mol of nitrogen gas at a temperature of 300 K ?

D) Find the pressure in mmHg of a 0.122 g sample of helium gas in a 648 mL container at 34 ∘C. Express the pressure to three significant figures and include the appropriate units.

E) What is the temperature of 0.50 mol of gas at a pressure of 1.1 atm and a volume of 11.5 L ? Express the temperature in kelvins to two significant figures.

F) What volume does 0.482 mol of gas occupy at a pressure of 719 mmHg at 59 ∘C? Express the volume to three significant figures and include the appropriate units.

G) Use the molar volume of a gas at STP to calculate the density of carbon dioxide gas at STP. Express the density in grams per liter to three significant figures.

Thank you so much in advance! Much appreciated! I've been working on these questions for the past week and can't get them at all.

Answer #1

Part A)
If the sample is compressed to a volume of 15.4 L , what is its
pressure?
Express the pressure in atmospheres to three significant
figures.
Part B) A syringe containing 1.30 mL of oxygen gas is cooled
from 97.1 ∘C to 0.4 ∘C. What is the final volume Vf of
oxygen gas?
Part C)
What is its volume after an additional 0.26 mol of gas is added
to the cylinder? (Assume constant temperature and pressure.)
Express your answer...

1. A sample of gas with an initial volume of 28.2 L at a
pressure of 728 mmHg and a temperature of 301 K is compressed to a
volume of 14.9 L and warmed to a temperature of 375 K. What is the
final pressure of the gas?
2. A gas sample with a volume of 5.3 L has a pressure of 725
mmHg at 24C. What is the pressure of the sample if the volume
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Part A
How much potassium chlorate is needed to produce 22.0
mL of oxygen gas at 675. mmHg and
22. ∘C?
Express the mass to three significant digits.
?g
Part B
If oxygen gas were collected over water at 22 ∘C and
the total pressure of the wet gas were 710 mmHg , what
would be the partial pressure of the oxygen?
Express the partial pressule in mm Hg to three significant
digits
?mmHg
Part C
An oxide of nitrogen was found by...

In a gas mixture, the partial pressures are argon 455 mmHg ,
neon 90 mmHg , and nitrogen 125 mmHg .
Part A
What is the total pressure (atm) exerted by the gas mixture?
--------------------------------------------------------------------------------------------------------------------------------------------
Part B
What is the volume, in liters, of 4.00 moles of methane gas,
CH4, at 11 ∘C and 1.60 atm?
Express your answer with the appropriate units.
---------------------------------------------------------------------------------------------------------------------------------------------
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1. A sample of gas in a cylinder as in the example in Part A has
an initial volume of 48.0 L , and you have determined that it
contains 1.20 moles of gas. The next day you notice that some of
the gas has leaked out. The pressure and temperature remain the
same, but the volume has changed to 12.0 L . How many moles of gas
(n2) remain in the cylinder? Express your answer with the
appropriate units....

1. A cylinder with a moveable piston contains 0.89 mol of gas
and has a volume of 327 mL. What will its volume be if an
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***different kind of question next***
2. A bag of potato chips contains 595 mL of air at 35.0 ∘Cand a
pressure of 765 mmHg. Assuming the bag does not break, what will be
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A mixture of helium, nitrogen, and oxygen has a total pressure
of 759 mmHg . The partial pressures of helium and nitrogen are 233
mmHg and 200 mmHg , respectively.
1. What is the partial pressure of oxygen in the mixture? PO2 =
______ mmHg
2. What volume of O2 at 988 mmHg and 21 ∘C is required to
synthesize 19.0 mol of NO?
Express your answer to three significant figures and include the
appropriate units. volume of O2 =...

1. Use the molar volume to calculate each of the following at
STP:
A.Calculate the number of moles of CO2 in 1.40 L of CO2 gas.
Express your answer to three significant figures and include the
appropriate units.
B.Calculate the volume, in liters, occupied by 0.200 mol of He
gas.Express your answer to three significant figures and include
the appropriate units.
C.Calculate the volume, in liters, occupied by 4.00 g of O2
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A gas sample has a volume of 0.954 L at a pressure of 764 mmHg.
What would be the pressure of the gas if the volume is changed to
418 mL ? Assume that the amount and the temperature of the gas
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three significant figures. I changed the L to 954 mL which gave me
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1. To what Celsius temperature must 67.5 mL of krypton gas at
17.0°C be changed so the volume will triple? Assume the pressure
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2. Calculate the volume of 50.5 g of C2H2 gas at standard
temperature and pressure (STP). Use a molar mass with at least as
many significant figures as the data given.
3. Calculate the volume of 41.5 g of NH3 gas at...

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