Name
Date
MOLE & GAS REVIEW
1. Find the molar mass of the following compounds:
a) CO2:________________
b) H2O:________________
c) Cl2 :________________
c) Mg3(PO4)2 :________________
Conversions:
(Remember: When in a hole convert to a mole!)
1 mole = 6.02 x1023 particles
1 mole = molar mass (grams) -see periodic table
1 mole = 22.4 Liters of a gas
(only for gases, only at STP)
2. How many moles are in 495 grams of CO2?
3. How many moles are in 9.54 x 1025 molecules of water?
4. How many liters of hydrogen gas do you have if a balloon contains 0.194 moles of gas?
5. What is the mass of 5.38 x 1024 molecules of ammonium oxalate?
6. How many molecules of lead (II) oxide, PbO, are there in a 57.2 g sample?
7. How many liters are in 22 grams of O2 gas?
8. How many moles are present in 500.0 g of sodium hydroxide?
9. What is the percent composition of CuSO4?
10. What is the percent composition of Fe2O3?
Gases!
Each of the following examples gives a change in volume, temperature, amount or pressure of a gas sample. Indicate
whether the other variable mentioned would increase, decrease or stay the same as a result. If a variable is not mentioned,
assume it is constant.
1. Additional gas is added to a soccer ball. The pressure _______________________.
2. An inflated balloon is placed in a refrigerator. The volume _____________________.
3. Dry ice is sealed in a plastic bag. As the temperature increases, the amount of gas present in the bag __________.
4. The volume of an inflated balloon increases when the amount of gas in the balloon ___________________.
5. A person sits on an air mattress. The pressure _______________________.
6. An aerosol can of air freshener is sprayed into a room. The pressure of the gas in the can __________________ if its
temperature remains constant.
7. The volume of air in human lungs increases before it is exhaled. Assume the pressure stays constant, the temperature of
the air in the lungs ___________________________.
8. A leftover hamburger patty is sealed in a plastic bag and placed in the refrigerator. The volume of the air in the bag
___________________.
9. If the temperature in an inflated expandable balloon is increased, the pressure of the gas inside the balloon
________________________.
10. In a light bulb the pressure of the gas inside the light bulb will __________________ a few minutes after the light is
turned on?
11. When shave cream (in a pressurized can) is sprayed as a prank all over your house, the shave cream’s temperature
____________________as it is sprayed out of the nozzle.
12. Weather balloons are released from ground level partially inflated. The volume of the balloon _____________ as
the balloon reaches a high altitude while the number of particles inside the balloon _______________. The temperature at
higher altitudes is quite cold which _____________the volume of the balloon.
13. According to the Ideal Gas Law describe the properties and characteristics of an ideal gas.
Equations will be given, you must know what the symbols mean!
P1V1 = P2V2
760 mmHg = 1 atm = 101.3 kPa = 760 torr = 14.70 psi
PV=nRT
R= 0.08206 L atm/ mol K
13. A 540.0 mL sample of nitrogen is warmed from 24.0 °C to 92.0 °C. Find its new volume if the pressure
remains constant.
14. A balloon has a volume of 400.0 mL on a day when the temperature is 30.0 °C. If the temperature inside is
to 18.0 °C, what will be the volume of the balloon if the pressure remains constant?
15. A 783 mL volume of gas is collected at 630 K and 1.32 atm. What Volume would this sample of gas
occupy at room temperature (23 ° C) and .97 atm of pressure?
16. To what pressure must a gas be compressed in order to get 200.0 L of a gas at STP into a smaller 15.3 L
storage container?
17. How many moles of air are used to fill a balloon to 4.00 L at room temperature and normal atmospheric
pressure? (23ºC and 755 mmHg)
18. If 50.0 L of CO2 is at 22.0oC and 103.4 kPa, how many moles are present?
19. How many L of H2 are produced at 1.50 atm and 19.0oC if a reaction gives off 4.29 g H2?
20. If 28.0 L of O2 at 32.0oC and 99.4 kPa are present, how many moles and then grams of O2 are present?
21. As Pressure increases the Temperature______________________.
22. As Volume decreases the Pressure_________________________.
23. As the Temperature decreases the Volume __________________.
24. As the Volume increases the Pressure ______________________.
25. When comparing a solid, liquid, and gas, which one has the most energy? How can you tell?
26. Which one has the least? How can you tell?