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Question

ΔH is positive and ΔS is negative then the reaction is:


A
spontaneous only at high temperature
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B
spontaneous only at low temperature
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C
spontaneous at all temperature
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D
non-spontaneous at all temperature
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Solution

The correct option is D non-spontaneous at all temperature
Sign of ΔH Sign of ΔS Comment Example ΔHo298 ΔSo298
+ spontaneous H2(g)+Cl2(g)2HCl(g) 185 14.1
at all temperature C(s)+O2(g)CO2(g) 394 3

spontaneous H2(g)+1/2O2H2O(l) 44 119
at low temperature 2SO2(g)+O2(g)2SO3(g) 198 187

+ + spontaneous NH4Cl(s)NH3(g)+HCl(g) 176 284
at high temperature N2(g)+O2(g)2NO(g) 180 25

+ Non spontaneous 3O22O3 286 137
at all temperature 2H2O(l)+O2(g)2H2O2(l) 196 126


The reaction is not spontaneous at any temperature.
Option D is correct.

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