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how many grams are there in 1.4 x 10^23 molecules of water?

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what does a mol of water weigh ?
2*1 + 1*16 = 18 grams/ mol
so water is 18 grams per 6.02*10^23 molecules
so
1.4 * 10^23 molecules * [ 18 grams / 6.02*10^23 molecules ] = 4.19 grams
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