Gases Practice
Complete - include given, formula, setup, answer, sig. figs and units
1. At what temperature will a 1.0 g sample of neon gas exert at a pressure of
500. torr in a 5.0 L container? Law? _______________
2. How many moles of gas are contained in 890.0 mL at 21.0 °C and 750.0 mm
Hg pressure? Law? _______________
3. What pressure exists in a 25.0 L tank containing 26.3 g of N2 at 27 C?
Law? _______________
4. A gaseous mixture contains 5.23 g of N2 and 4.41 g of O2. What volume
does this mixture occupy at 25 C and 1.00 atm pressure?
Law? _______________
5. A container holds three gases: oxygen, carbon dioxide, and helium. The
partial pressures of the three gases are 765 torr, 751 torr, and 735 torr,
respectively. What is the total pressure inside the container?
Law? _______________
6. A sample of nitrogen gas is collected over water, yielding a total volume of
62.25 mL at a temperature of 22°C and a total pressure of 97.7 kPa. What is
the pressure of the dry nitrogen at the same temperature? Law? _________
7) .970 atm
9) 1.10 L
8) .0150 mol O2; .20 mol He; .22 mol total; PO2 = .367 atm; PHe = 4.9 atm
10) .851 L
11) 3.25 L
12) 7.8 x 10-3 mol
7. Hydrogen gas is collected by water displacement. Total volume collected is
0.461 L at a temperature of 17°C and a pressure of 0.989 atm. What is the
pressure of dry hydrogen gas collected? Law? _______________
8. A 1.00 L at 25 °C tank contains .480 grams of oxygen and .8000 grams of
helium. Calculate the following. How many moles of O2 are in the tank? How
many moles of He are in the tank? Total moles of gas in tank. Partial
pressure of O2. Partial pressure of He.
9. If 1.39 g of carbon monoxide is reacted with oxygen, what volume of carbon
dioxide is produced at 12.3oC at 107.4KPa?
10. Zinc metal reacts vigorously with hydrochloric acid to form hydrogen gas and
zinc chloride. What volume of hydrogen gas at 65 C and 1.01 atm is formed
from the reaction of 2.03 g of zinc in excess hydrochloric acid?
11. Ammonium chloride, when heated decomposes into hydrochloric acid and
ammonia gas. If 5.03 g of ammonium chloride decomposed completely what
volume of ammonia gas would be collected at 24 C and 535 mm Hg.
12. How many moles of C8H18 (octane) are required to fill a 1.4 dm3 airbag with
CO2 if the wrecker truck burns octane at STP? (Exhaust fumes are used to fill
airbags to upright flipped tractor trailers.)
1) 8.0 x 102 K
5) 2251 torr
2) .03640 mol
6) 95.1 kPa
3) .925 atm
4) 7.95 L