How many moles are in 20.2 ml of 20oC distilled water? (Density of water at 20oC = 0.9982 g/ml)?

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How many moles are in 20.2 ml of 20oC distilled water? (Density of water at 20oC = 0.9982 g/ml)?

2007-01-23 15:13:21 · 2 answers · asked by shawny2cute 1 in Science & Mathematics ➔ Chemistry

2 answers

welll first use M/V= density and rearrange to V*D=M

20.2 ml x 0.9982 G/ml= 20.164 Grams of Water

20.164 grams of H20 x 1 mol H20/ 18.02 Grams=1.12 mols H20

2007-01-23 15:30:22 · answer #1 · answered by bob m 2 · 0⤊ 0⤋

Without much loss in accuracy, 20.2 ml is just about 20.2 grams of water. Molecular weight of water=18.
So moles= 20.2 g/18g/mole= 1.12

2007-01-23 23:23:19 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋