Question

3 mol ammonia contains how many gm of hydrogen and nitrogen

Answer 1

1 mole of NH3 = 17 grams
3 mole NH3 = 51 grams
in which N = 14 ×3 = 42 grams
& H = 3 × 3 = 9 grams

Answer 2

Concept:

The grams of any element can be calculated by multiplying the given number of moles with the molecular mass of the element.

Given:

3 moles of ammonia.

Find:

The grams of hydrogen and nitrogen in 3 moles of ammonia.

Solution:

1 mole of NH₃ contains 17 grams and 3 moles of NH₃ contain 51 grams.

In one mole of NH₃, there is one mole of nitrogen having a mass of 14 grams. So, in 3 moles of NH₃, the mass of the nitrogen is,

N = 14 × 3 = 42 grams

Similarly, in one mole of NH₃, there are three moles of hydrogen having the total mass of hydrogen as 3 grams as the mass of one hydrogen is 1 gram. So, in 3 moles of NH₃, the mass of the hydrogen is,

H = 3 × 3 = 9 grams

Hence, the 3 moles of ammonia contain 9 grams of hydrogen and 42 grams of nitrogen.

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