Question

5kg N2 react with 2kg of H2 to get ammonia(NH3)
a) calculate the mass of ammonia produced
b) calculate the mass reactant which left in the reaction.​

Answer 1

N

2

+3H

2

⟶2NH

3

Molecular mass of Nitrogen =28g/mol=0.028kg/mol

Molecular mass of Hydrogen =6g/mol=0.006kg/mol

Molecular mass of Ammonia =17g/mol=0.017kg/mol

Now, according to the balanced chemical equation,

0.028 kg of Nitrogen reacts with 0.006 kg of Hydrogen.

∴ 50 kg of Nitrogen reacts with [

0.028

(0.006×50)

]=10.71kg of Hydrogen.

The amount of Hydrogen (given 10 kg) is less than the amount required (i.e., 10.71 kg) for 50 kg of Nitrogen.

Therefore, Hydrogen is the limiting reagent.

Hence, the formation of Ammonia will depend on the amount of Hydrogen available for reaction.

∵ Amount of ammonia produced by 0.006 kg of hydrogen =2×0.017=0.034kg

∴ Amount of ammonia produced by 10 kg of Hydrogen =

0.006

0.034×10

=56.67kg

Hence, 56.67 kg of ammonia gas will be formed and hydrogen will be limiting reagent.