What is the percentage of oxygen in nitrous oxide?

Answer 1

There is one atom of oxygen per molecule of nitrous oxide (N2O). Therefore, using atomic percent, it is 1/3 oxygen.

However, the mass of oxygen and nitrogen are different, and so the mass percent of oxygen is not 1/3. Nitrogen atoms weigh 14 grams/mole, and oxygen atoms weigh 16 grams per mole, so N2O weighs 44 grams per mole, so the percent oxygen is:

16 ÷ 44 *100% = 36.36% by mass.

Answer 2

I found one mil spec site that refers to 95% pure for medical oxygen.

There are a number of vendor sites and others which give me the impression that the acceptable range is from 85 to 99.9 %. From those same sites, I gather that the most common are 93, 95 and 98 %.

Answer 3

Dry Air is composed of approximate 20.95% oxygen and 78.08% nitrogen, along with 0.93% argon and 0.04% trace gases.

Answer 4

Roughly, 78%