For water, H2O
1 mol H2O = 18.0 g H2O
1 mole H2O = 6.022x1023 H2O molecules
Comparing the mass of 1 molecule and 1 mol of H2O. Both masses have the same number but different units (atomic mass units and grams). Expressing both masses in grams indicates their huge difference: 1 molecule H2O has a mass of 2.99 10-23 g whereas 1 mol H2O has a mass of 18.0 g.
How many H2O molecules are in a 9.00-g sample of water?
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