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Question

In the Haber process:
N2(g)+3H2(g)2NH3(g)
30L of H2 and 30L of N2 were taken for reaction which yielded only 50% of expected product. What will be the composition of the gaseous mixture in the end?

A
20 L NH3, 25 L N2 and 20 L H2
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B
10 L NH3, 25 L N2 and 15 L H2
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C
20 L NH3, 10 L N2 and 30 L H2
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D
20 L NH3, 25 L N2 and 15 L H2
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Solution

The correct option is A 20 L NH3, 25 L N2 and 20 L H2
For the following reaction
N2+3H22NH3
We are given 30 L of H2 and 30 L of N2
From the equation it is clear that
for 3 volume of H2 - 1 volume of N2 required
thus, 30 volume of H2 will require 10 volume of N2
again, from 3 volume of H2 - 2 volume of NH3 is formed
thus, from 30 volume of H2 ,20 volume of NH3 is formed
so, from the given amount of H2 and N2(i.e 30 L each) it is clear that
10 L of N2 react with 30 L of H2 to give 20 L of NH3
but, according to question the yeild of NH3 is 50% of the expected i.e 10 L of NH3 is produced.

now again from the equation
2 volume of NH3 is formed from 1 volume of N2
thus, 10 volume of NH3 will be formed from 5 volume of N2
i.e 10 L of NH3 will be formed from 5L of N2

2 volume of NH3 is formed from 3 volume of H2
thus, 10 volume of NH3 will be formed from 15 volume of H2
i.e 10 L of NH3 will be formed from 15 L of H2

thus, overall 5L of N2 and 15 L of H2 is used to produce 10 L of NH3
hence the remaining amount of N2 = 30 -5 = 25 L
remaining amount of H2 = 30-15 = 15 L
and amount of NH3 produced is 10 L
thus option B is correct.



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