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How many moles of H2O are in 3.00L of water? (d=1.00g/mL)

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How many grams? That's mass = volume x density. Substitute and solve for grams. Then mols = grams/molar mass.

(3.0L H20)(1000g/L)(1 mol/18g)
= 166.7 mol H2O

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