Question

The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in this sample?

Answer 1

The sample contains 1.00 mol H₂O.

Moles of water = 18.0 g H₂O × 1 mol H₂O/18.0 g H₂O = 1.00 mol H₂O