Question

In the formation reaction of NH3from N2and H2, 140g of N2and 40 g H2were mixed. Select the option(s) which is are not correct.A) Maximum mass of NH3which can be formed is 180 g.B) If % yield of reaction is 80%, then H2consumed will be 32 g.C) Some N2(g) will be left after the reaction.D) If NH3formed is 85 g then % yield will be 50%.

Answer 1

Correct option is

C

56g of N

2

+10g of H

2

N

2

(g)+3H

2

(g)→2NH

3

(g)

In the given reaction, 1 mol of N

2

reequires 3 moles of H

2

for the formation fo ammonia.

Thus if the number of moles of N

2

and H

2

should be in ratio 1:3.

We know,

n=

molecular weight

weight

Thus in option C 56g of N

2

means 2 moles of N

2

and 10g of H

2

means 5 moles of H

2

.

Thus here H

2

acts as limiting reagent.