Molar Mass of H2O
How to work out the molar mass of H2O
- Count the atoms of each element in H2O: 2 H and 1 O.
- Multiply each count by the element's atomic weight: 2 × 1.008 = 2.016; 1 × 15.999 = 15.999.
- Add the results: 2.016 + 15.999 = 18.015 g/mol.
Frequently asked questions
What is the molar mass of H2O?
The molar mass of water (H2O) is 18.015 g/mol, so one mole of it weighs 18.015 grams.
How many moles are in 100 grams of H2O?
100 g ÷ 18.015 g/mol = 5.551 mol.
Which element makes up most of the mass of H2O?
O, at 88.81% of the mass.
Common compounds
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