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Question

The number of moles of hydrogen molecules required to produce 20 moles of ammonia by Haber's process is:

A
10
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B
20
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C
30
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D
40
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Solution

The correct option is C 30
Haber's process
N2(g) + 3H2(g) 2NH3(g)

20 moles need to be produced
2 moles of 2NH3 gives 3 moles of 3H2
Hence, 20 moles of NH3 gives 3×202 = 30 moles of H2

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