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Question

The molecular mass of NH3 is ________.

A
16 u
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B
18 u
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C
10 u
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D
17 u
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Solution

The correct option is D 17 u
Molecular mass is equal to the sum of the masses of its constituent atoms.

Atomic mass of nitrogen = 14 u
Atomic mass of hydrogen = 1 u

Molecular mass of NH3
= atomic mass of nitrogen + 3 × atomic mass of hydrogen
= 14 + (3 ×1) = 14+3 = 17 u.

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