Gram molecular mass of ammonia is:

20g

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17g

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22g

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18g

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Solution

The correct option is B 17g
The molecular formula of ammonia is $N H_{3}$ . Gram molecular mass is the sum of gram atomic mass of all the atoms present in the molecule.

$∙$ Gram atomic mass of nitrogen = 14 g
$∙$ Gram atomic mass of hydrogen = 1 g

Gram molecular mass of ammonia ( $N H_{3}$ ) = gram atomic mass of nitrogen + 3×gram atomic mass of hydrogen

Thus, gram molecular mass of ammonia = $14 + (3 \times 1)$ = 17 g

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