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Question

The relative molecular masses of hydrogen, nitrogen, oxygen and chlorine are double their relative atomic masses.


A
True
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B
False
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Solution

The correct option is A True
Atomic mass of Hydrogen= $$1.007$$
Atomic mass of Oxygen= $$15.99$$
Atomic mass of Nitrogen= $$14.006$$
Atomic mass of chlorine= $$35.5$$

Molecular mass of hydrogen= $$2\times 1.007=2.014$$
Molecular mass of oxygen= $$2\times 15.99= 31.99$$
Molecular mass of nitrogen= $$2\times 14.006=28.01$$
Molecular mass of chlorine= $$2\times 35.5=71$$

This is because in molecular state hydrogen, nitrogen, oxygen and chlorine exist as $$H_2,N_2,O_2$$ and $$Cl_2$$ respectively. Atomic mass is of single atom, while molecular mass of these element is of their combined state and as they exist as diatomic their molecular mass are double of their atomic mass.

Chemistry

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