An 95.4-mL sample of wet O2 is collected over water at 21.3 degrees celcius at a barometric pressure of 741mmHg (vapor pressure of water at 21.3 degrees celcius = 19mmHg).
Known: The partial pressure in this sample of O2 is 722mmHg.
What is the volume percent O2 in the gas collected?
How many grams of O2 are present in this sample?
Method is the most important part, if need be use different values as long as your method is clear.