It never was - Nitrogen is the "major gas".
Oxygen
Oxygen
carbon dioxide
Oxygen
oxygen
Oxygen is the principal component of atmospheric air (approx. 80 %).
An atmospheric gas; a by product of the light reaction of photosynthesis; essentials to aerobic respiration.
Oxygen gas (when we exhale, we breathe out carbon dioxide).
Most plants release some oxygen from atmospheric carbon dioxide.
oxygen
oxygen
There are many different ways to calculate the moles and grams of oxygen. but one mole of oxygen is always gonna equal 32 grams because its diatomic, meaning it only comes in nature as O2. so it would be the atomic mass of oxygentimes 2. 16*2= 32