Q. 194.7( 3 Votes )

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

Answer :

The mass of 1 mole of a substance is equal to its relative atomic or molecular mass in grams.

Mass of one mole of neutrons = 1g


Mass of one neutron =


No of neutrons in H = 0


No of neutrons in O = 8


Total neutrons in water (H2O) = 2 × 0 + 1 × 8 = 8


Mass of 8 neutrons =


The molar mass of water = 18g


Mass of one molecule of water =


Fraction of mass of water due to neutrons = = 0.444 = 44.44%


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