Physics

I've tried everything and can't come up with the correct answer. Help!
A liter of water has a mass of 1 kg and the mass of a water molecule is 18 amu. How many molecules of water are there in 4 L of water?

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  1. (4 kg / 18 amu) * (1 amu / 1.7E-27 kg)

    careful of sig figs

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