1.
What is the total pressure of the gas in each manometer?
2. A gas occupies 800. mL at 1.00 atm. At what pressure will the gas occupy
430. ml? (n and T are constant)
3. A 150. mL sample of argon gas exerts a pressure of 830. mm Hg at 25.0
ºC. At what temperature (Kelvin and Celsius) will the volume decrease to
125 mL if P and n are constant?
4. If 8.0 moles of carbon dioxide occupy a volume of 5.0 liters, what volume
will 20.0 moles of carbon dioxide occupy at the same temperature and
pressure?
5. If 5.0 moles of a gas exert a pressure of 740 mm Hg, how many moles will be
needed to exert a pressure of 1200. Mm Hg? (volume and temperature are
constant)
6. The pressure in an aerosol container is 1.7 atm at 27 ºC. What will the
pressure be if the temperature is lowered to - 73 C? (n and V are constant)
7. A gas occupies 2.0 L at 127º C and a pressure of 1.9 atm. At what
temperature will the gas occupy 3.0 L at a pressure of 1.5 atm? (n is
constant)
8. If 4.0 grams of oxygen gas occupy a volume of 22.0 L at 25 C, what volume
will 14.0 grams occupy at the same temperature and pressure?
9. If a gas occupies 2.00 liters at a pressure of 148 mm Hg, what volume will it
occupy at 1.20 atm? (n and T constant)
10. A sample of gas in a container of fixed volume at 28.0 ºC is at a pressure of
.500 atm. What temperature (ºC) is required to change the pressure to 0.750
atm? (n and V are constant)
11. A 35.4 L tank of oxygen is at 25.0 ºC and under a pressure of 125 atm. What
volume would the oxygen occupy at 1.00 atm and 25.0 C? (n is constant)
12. A sample of a gas in a rigid container (volume is constant) is heated from
273 ºC to 373º C. If the gas was initially at a pressure of 1.0 atm, what is the
final pressure?
13. A 300. mL sample of He gas at 135º C is cooled to 150. K. What will the
volume be if the pressure is kept constant?
14. If 10.0 moles of nitrogen gas occupy 15.0 liters, what will 2.50 moles of the
gas occupy? (same temp and pressure)
15. What volume will 5.00 moles of oxygen occupy at a temperature of 25.0 ºC,
and a pressure of .800 atm?
16. How many moles of nitrogen are in in 50.0 liter tank under a pressure of 25
atm and a temperature of 30.0ºC?
17. How many grams of oxygen are contained in a 5.00 liter tank at 60.0º C and
a pressure of 1500.mm Hg?
18. At what temperature (Kelvin and Celsius) will 8.0 moles of helium occupy at
a volume of 2000. milliliters a pressure of 750 Torr (Torr is the exact same
unit as a mmHg)?
19. What is the molar mass of a gas if 5.00 grams of the gas occupy a volume of
10.0 liters at a pressure of 740 mm Hg and a temperature of 25 ºC?
20. An unknown gas is at a temperature of 24º C. a pressure of 1.2 atm and
occupies a volume of 8.00 liters. It has a mass of 10.0 grams.
a. What is its density?
b. What is its molar mass?
21. The density of oxygen at 20 C is .0013 grams/ml what is the pressure?
22. What volume will 3.00 moles of hydrogen gas occupy at STP?
23. How many moles of nitrogen gas are there in 100. liters at STP?
24. How many molecules of sulfur dioxide gas are contained in 1.00 mole of
the gas at STP?
25. How many molecules will be in 1.00 liter of sulfur dioxide gas at STP?
26. A student produced 25.0 ml of nitrogen gas in an experiment. The
experiment was performed at STP. How many grams of nitrogen were
produced?
27. What is the molar mass of a gas if 2.60 grams of the gas occupy a
volume of 8.56 liters at STP?
28. What is the density of nitrogen gas
a. at STP?
b. at 200.ºC and .75 atm?
29. How many grams of carbon dioxide are in 10.0 liters of the gas at STP?
30. What volume will 10.0 grams of nitrogen gas occupy at
a. STP?
b. -10.0 ºC and 1.2 atm?
31. What is the density of CH4 at
a. STP?
b. 25.0º C and 1.8 atm?
32. What is the density of CH4
a. at STP?
b. at 20 C and 1.2 atm?
33. Write the balanced equation for burning of CH4 in oxygen.
If 160.0 grams of CH4 burns in excess oxygen what volume of water vapor
will be produced
a. at 20.0 ºC and the pressure is 750. mm Hg?
b. at STP?
34. 8.00 liters of C3H8 are allowed to react with 8.0 liters of oxygen gas. The
experiment is done at 20.0º C and 1.10 atm? (You must find L.R.)
a. Write the balanced equation for the reaction
b. What volume of carbon dioxide gas will be produced?
c. How many grams of water vapor will be produced?
35. Sodium bicarbonate (baking soda) decomposes to produce sodium oxide,
water and carbon dioxide gas.
a. Write the proper formulas of reactants and the products
b. Write the balanced equation for the reaction.
c. What mass of sodium bicarbonate is needed to produce 2.4 liters of carbon
dioxide at STP?
36. If 1.00 mole of hydrogen and 10.0 moles of helium are placed in a 2.00 liter
tank at 25.0 ºC,
a. What will be the partial pressure of each gas?
b. What will be the total pressure in the tank?
37. What is the molar mass of a gas that diffuses .71 times as fast as O 2 ?
38. How does the rate of diffusion of CH4 gas compare to oxygen gas?
39. How does the rate of diffusion of CH4 gas compare to hydrogen gas?
40. Calculate the relative rates of diffusion of carbon monoxide to neon.
41. Calculate the relative rates of diffusion of hydrogen gas to uranium
hexafluoride.
42. The relative rate of diffusion between two gases is 1.89. The lighter gas is
methane (CH4). What is the molar mass of the other gas?