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Question

The Haber's process for production of ammonia involves the equilibrium:
N2(g)+3H2(g)2NH3(g)
Assuming ΔHo and ΔSo for the reaction do not change with temperature, which of the statements is true?
(ΔHo=95kJ and ΔSo=190JK1)

A
Ammonia dissociates spontaneously below 500K
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B
Ammonia dissociates spontaneously above 500K
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C
Ammonia dissociates at all temperatures
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D
Ammonia does not dissociate at any temperature
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Solution

The correct option is A Ammonia dissociates spontaneously below 500K
ΔGo=ΔHoTΔSo
=95×1000500×(90)
=0
Thus at temperatures below 500K, ΔG<0.

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