Question

The weight-percent of nitrogen in ammonia (NH3) is 82.25%. The atomic weight of hydrogen is 1.008. Calculate the atomic weight of nitrogen for the same.​

Answer 1

Answer:

Answer:

The atomic weight of Nitrogen is 14

Explanation:

We know that

Weight percent of an element = \frac{Weight of the element}{Weight of the compound} * 100

Weightofthecompound

Weightoftheelement

∗100

=> Weight percent of N = \frac{Weight of N}{Weight of N+ Weight of H_3} * 100

WeightofN+WeightofH

3

WeightofN

∗100

Let the weight of N be w

It is given that the weight of Hydrogen is 1.008

=> 82.25 = \frac{w}{w+ 3* 1.008} * 100

w+3∗1.008

w

∗100

=> 82.25 = \frac{100w}{w+ 3.024}

w+3.024

100w

=> 82.25w + 248.724 = 100w

=> 100w - 82.25w = 248.724

=> 17.75w = 248.724

=> w = 14.01

Therefore, the atomic weight of Nitrogen is 14.01 ≈ 14

Therefore, option (C) 14 is correct