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

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

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Solution.
In water molecule (H_{2}O), number of neutrons = [(number of neutrons in H) \times2+ (number of neutrons in O)] = 0\times 2 + 8 = 8(as number of
neutrons in H = 0)
Mass of 8 neutrons = 8\times 1.00893 = 8.07                     (mass of one neutron = 1.008934)
Molar mass of water = 1.008\times 2 + 16.0 = 18.016 u
There are 8 neutrons in one atom of oxygen
Mass of 8 neutrons=\frac{8}{N_{A}} g
Fraction of mass of water due to neutrons = \frac{8}{18}

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