Question

Fill in the balnks. 34 gm of Ammonia is decomposed to _________ gm of Nitrogen and _____ gm of Hydrogen, _____ is the ratio of hydrogen to nitrogen by mass.

• A. 28, 3 and 28:3
• B. 14, 6 and 14:6
• C. 14, 3 and 14:3
• D. 28, 6 and 14:3

Answer 1

The correct option is D

28, 6 and 14:3

34 gm of Ammonia is decomposed to 28 gm of nitrogen and 6 gm of hydrogen, 14:3 is the ratio of hydrogen to nitrogen by mass.

Atomic masses of nitrogen and hydrogen are 14 and 1 respectively.

Since there are three hydrogen atoms, total mass of hydrogen atoms is 3.

So the mass ratio is (Nitrogen):(Hydrogen) = 14:3

Total mass of compound is 34.

The mass of nitrogen is $\frac{14}{17}\times 34\Rightarrow$ 28 gm.

The mass of hydrogen is $\frac{3}{17}\times 34\Rightarrow$ 6 gm.