__More Unit 10 Practice Problems!__

1.) A 20.83 g sample of a gas
occupies 4.167 L at 79.97 kPa at 30.0 °C. What is its
molecular mass?

2.) Determine the number of moles
of Kr contained in a 3.25 liter gas tank at 5.80 atm
and 25.5 °C.

If the gas is oxygen instead of krypton, will the answer be the same?
Why or why not?

3.) Determine the number of grams of CO_{2 }in
a 450.6 mL tank at 1.80 atm
and -50.5 °C. Determine

the number of grams of oxygen that
the same container will contain under the same

temperature and pressure.

4.) A sample of gas is put into a
container that has a movable piston. Initially the volume is 4.00 liters when

the pressure is 600. mm Hg and the temperature is 50.0^{o}C. What will be
the new volume if the pressure

and temperature are both tripled?

5.) A mixture of 3 gases (composed
of Ne, He, and O_{2}) exerts a total pressure of 990. torr. If there are 10.0

moles each of He & Ne, and
there is 4.00 moles of O_{2}, what is the partial
pressure exerted by the O_{2} gas?

6.) What is the density of bromine vapor (in grams/liter)
at 775^{o}C and 75.5 kPa?