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
A
1.00 mole
B
18.0 moles
C
36.0 moles
D
324 moles
Explanation
Calculate moles by dividing the sample’s mass by water’s molar mass: 18.0 g ÷ 18.0 g/mol = 1.00 mol. The sample contains 1.00 mole of water, so choice A is correct.
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