Q.

In Haber's process of manufacturing of ammonia :

N2(g)+3H2(g)2NH3(g);H25C=92.2kJ

Molecule N2(g) H2(g) NH3(g)

CPJK1    29.1    28.8    35.1

If Cp is independent of temperature, then reaction at 100° C as compared to that of 25° C will be :

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a

Less endothermic

b

Less exothermic

c

More endothermic

d

More exothermic

answer is C.

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Detailed Solution

In the reaction we have

ΔCPRxn=2×35.13×28.829.1=45.3HT2HT1=ΔCPT2T1H100C=H25C+75×ΔCPH100C>H25CH100C<0

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