how much mass  much does oxygen weigh
Confidence votes 23. About 0.083 pound per cubic footThe density of oxygen at STP (Standard Temperature & Pressure) is 1.331 kilograms per cubic meter. Divide that by 35.3147 to get 0.03769 kilogram per cubic foot, which is equivalent to 0.08307 pound per cubic foot or 1.33 ounces per cubic foot.