UNIT 10 REVIEW WORKSHEET
1.)
Convert the following pressure measurements to atmospheres.
(A)  151.98 kPa                      (B)  456 mm Hg      (C)  912 torr

2.) What are the standard conditions for gas measurement?

3.) The volume of a sample of methane gas measures 350. mL at 27.0 oC and 810. mm Hg.  What is
the volume (in liters) at -3.0 oC and 650. mm Hg pressure?

4.) How many grams of nitrogen gas are contained in a 32.6 liter container at 34.4 oC and 579 torr?

5.) A mixture of four gases in a container exerts a total pressure of 955 mm Hg.  In this container,
there are 4.50 moles of nitrogen gas, 4.25 moles of carbon dioxide gas, 2.75 moles of hydrogen
gas, and 2.00 moles of oxygen gas.  What is the partial pressure of each gas?

6.) Compare the rates of effusion of carbon dioxide gas and carbon monoxide gas.

7.) An unknown gas effuses 1.37 times faster than chlorine gas.  What is the molar mass of the unknown gas?

8.) Given the following unbalanced reaction:
___ C5H12  +  ___ O2
à  ___ CO2  +  ___ H2O
How many liters of oxygen are needed to produce 45.7 liters of CO2?

9.) Given the unbalanced equation:
___ Mg  +  ___ O2
à  ___ MgO
How many liters of oxygen gas are required to produce 45.8 grams of magnesium
oxide?

10.) An aerosol can contains gases under a pressure of 4.50 atm at 20.0 oC.  If the can is left on a hot,
sandy beach, the pressure of the gases increases to 4.80 atm.  What is the temperature on the
beach (in oC)?

1.)  (A) 1.5003 atm   (B) 0.600 atm   (C) 1.20 atm
2.) 0 oC (or 273 K) & 1 atm                           3.) 0.393 L                     4.) 27.6 g
5.)
N2 = 318 mm Hg, CO2 = 301 mm Hg, H2 = 195 mm Hg, O2 = 141 mm Hg
6.) CO effuses 1.25 times faster than CO2.
7.) 37.8 g/mole                    8.) 73.1 L               9.) 12.8 L                 10.) 40.0 oC

EXTRA PROBLEMS FROM 11/23/09:

11.)  What is the density of HCl at STP?

12.)  250. mL of gas collected over water at 21.5 oC has a mass of 1.27 grams.  Atmospheric pressure is 30.17
inches of mercury.  (1 inch = 2.54 cm)  Find the molar mass of the gas.
(vapor pressure of water at 21.5 oC = 19.2 mm Hg)