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Chapter 22 - 22.26

26. The volume of 250cm 3 corresponds to a mass of 250g since the density of water is 1 . 0g / cm 3 .Thismass

corresponds to 250 / 18 = 14 moles since the molar mass of water is 18. There are ten protons (each with

charge q =+ e ) in each molecule of H 2 O, so

Q =14 N A q = 14(6 . 02

10 23 )(10)(1 . 60

10 − 19 C) = 1 . 3

10 7 C=13MC .