Question

Gram molecular weight of ammonia ${\text{NH}}_3$ is:

• A. 10 g
• B. 17 g
• C. 20 g
• D. 45 g

Answer 1

The correct option is B 17 g

Molecular weight of ammonia ${\text{NH}}_3$ can be calculated by calculating the weight of one atom of nitrogen and three atoms of hydrogen.
Weight of one mole of N atoms = 14 g
Weight of one mole of H atom = 1 g

Molecular weight of ammonia = 14 $\times$ (1) + 3 $\times$ (1) = 17 g.