Please help!! 
The concentration of oxygen in tropospheric air is 20.94% v/v. A 20L sample of air is collected at 101.2kPa and 298K.
a) calculate the concentration of oxygen present in the air sample in parts per million.
b) determine the volume of pure oxygen gas that could be extracted from the 20L sample of air at the same temperature and pressure.
I've got a few numbers, but I am not 100% sure... so please confirm it for me. I have a test later. Thanks a lot!!!
The concentration of oxygen in tropospheric air is 20.94% v/v. A 20L sample of air is collected at 101.2kPa and 298K.
a) calculate the concentration of oxygen present in the air sample in parts per million.
b) determine the volume of pure oxygen gas that could be extracted from the 20L sample of air at the same temperature and pressure.
I've got a few numbers, but I am not 100% sure... so please confirm it for me. I have a test later. Thanks a lot!!!