Question

find the mass of nitrogen contained in 178.5g of ammonia by using law of definite proportion​

Answer 1

Answer : The mass of nitrogen is, 147 grams.

Explanation : Given,

Mass of ammonia = 178.5 g

First we have to calculate the molar mass of ammonia.

The molar mass of nitrogen = 14 g/mole

The molar mass of hydrogen = 1 g/mole

Molar mass of ammonia $(NH_3)$ = $14+3(1)=17g/mole$

According to the Law of Definite Proportions, it states that the given chemical compound must contains its component elements in fixed ratio and it does not depend on the method of preparation.

As, 17 grams of ammonia contains 14 grams of nitrogen

So, 178.5 grams of ammonia contains $\frac{14g}{17g}\times 178.5g=147g$ of nitrogen

Therefore, the mass of nitrogen is, 147 grams.