Molar Mass of O2
How to work out the molar mass of O2
- Count the atoms of each element in O2: 2 O.
- Multiply each count by the element's atomic weight: 2 × 15.999 = 31.998.
- Add the results: 31.998 = 31.998 g/mol.
Frequently asked questions
What is the molar mass of O2?
The molar mass of oxygen gas (O2) is 31.998 g/mol, so one mole of it weighs 31.998 grams.
How many moles are in 100 grams of O2?
100 g ÷ 31.998 g/mol = 3.125 mol.
Which element makes up most of the mass of O2?
O, at 100.00% of the mass.
Common compounds
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