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The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is:
Detailed Solution
Haber's process: $N_2(g)+3H_2(g)\rightarrow2NH_3(g)$
2 moles of $NH_3$ require 3 moles of $H_2$.
So 20 moles of $NH_3$ require $\frac{3\times20}{2}=30$ moles of $H_2$.