Molar mass of oxygen
32.00 g/molO₂
Molar mass
Molar mass. The mass of one mole in grams: add the atomic mass of every atom in the formula. Masses. Standard atomic masses to two decimals, hydrogen 1.008, every element to uranium. Typing. Ca(OH)2, (NH4)2SO4, CuSO4.5H2O and K4[Fe(CN)6] all work.
32.00g/mol
O₂
- O× 2100.00%
- O2 × 16.0032.00
- Total32.00 g/mol
Grams, moles, particles
Type any one. The other three fill in. Moles. From grams, particles or litres they are rounded to 3 significant figures first, as in a worked answer. 1 mol = 6.022 × 10²³ particles = 22.7 L of gas at STP (1 bar); 22.4 L at 1 atm.
1 mol of O₂ = 6.022 × 10²³ molecules
At 1 atm (older value): 22.40 L
Add up the atoms
- Oxygen: 2 × 16.00 = 32.00 g
- Molar mass = 2 × 16.00 = 32.00 g/mol
Share of the mass
- Oxygen100.00%
1 mol of O₂ = 32.00 g
1 g of O₂ = 0.03125 mol
Oxygen is made of O₂ molecules, so 1 mol of it is 32.00 g. A mole of oxygen atoms, O, is 16.00 g.
Molar mass of oxygen: quick answers
What is the molar mass of oxygen?
The molar mass of oxygen, O₂, is 32.00 g/mol. So 1 mol of oxygen has a mass of 32.00 g.
How do you calculate the molar mass of O₂?
Add the atomic masses of all the atoms: 2 × 16.00 = 32.00 g/mol.
How many moles are in 100 g of oxygen?
Divide the mass by the molar mass: 100 ÷ 32.00 = 3.13 mol of O₂.