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What is the fraction of the mass of water due to neutrons?

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- 8/18 

Mass of one mole (Avogadro Number) of neutrons - 1 g 

Mass of one neutron =  1 / Avogadro Number (NA)g 

Mass of one molecule of water =  Molar mass / N = 18 /NA g

There are 8 neutrons in one atom of oxygen 

Mass of 8 neutrons =  8/ NA 

Fraction of mass of water due to neutrons - 8 /18

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