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Question
What is the fraction of the mass of water due to neutrons?
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Solution
Mass of one mole (NA) of neutrons = 1g
Mass of 1 mole of H2O = 18
Mass of one molecule of water = `18/"N"_"A""g"`
Number of neutrons in one atom of H = 0
Number of neutrons in one atom of O = 8
Mass of 8 neutrons (in H2O) = `8/"N"_"A"`
Fraction of mass of water due to neutrons
= `(8/"N"_"A")/(18/"N"_"A")` or `8/18 = 4/9`
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