1.A sample of oxygen gas was collected via water displacement. Since the oxygen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 26.426.4 C is 727727 torr, what is the partial pressure of oxygen? The vapor pressure of water at 26.426.4 C is 25.8125.81 mm Hg.

2.A gaseous compound has a density of 1.45 g/L1.45 g/L at 27.8 C27.8 C and 1.27 atm.1.27 atm. What is the molar mass of the compound?

3. A 1.35 g1.35 g sample of an unknown gas at 27 C27 C and 1.10 atm1.10 atm is stored in a 2.35 L2.35 L flask.

What is the density of the gas?

density:

What is the molar mass of the gas?