Q. 194.7( 3 Votes )

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

Class 9th NCERT Science - Exemplar 3. Atoms and Molecules

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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