Question: how to calculate the mass percentage of oxygen in dry air?
Answer: Answer. 5.0/5. sanitha. 1jaiz4 learned from this answer. (0.20948 x 31.998) / ( (0.78084 x 28.013) + (0.20948 x 31.998) + (0.00934 x 39.948) + (0.000375 x 44.0099) + ...  Incognit-oh-no… Log in or create an account to stay incognito. Or, you can just switch to normal browsing. Log in. ...  Click to let others know, how helpful is it.