A reaction has delta H degree = 61.9 kJ/mol and delta S degree = 405.4 J/K. Is t

Question

A reaction has delta H degree = 61.9 kJ/mol and delta S degree = 405.4 J/K. Is this reaction spontaneous or nonspontaneous? At what temperature (if any) can the spontaneity be reversed? spontaneous, can be made nonspontaneous at 153 K spontaneous, cannot be made nonspontaneous at any temperature nonspontaneous, can be made spontaneous at 153 K nonspontaneous, cannot be made spontaneous at any temperature A reaction has delta H degree = 61.9 kJ/mol and delta S degree = 405.4 J/K. Is this reaction spontaneous or nonspontaneous? At what temperature (if any) can the spontaneity be reversed? spontaneous, can be made nonspontaneous at 153 K spontaneous, cannot be made nonspontaneous at any temperature nonspontaneous, can be made spontaneous at 153 K nonspontaneous, cannot be made spontaneous at any temperature A reaction has delta H degree = 61.9 kJ/mol and delta S degree = 405.4 J/K. Is this reaction spontaneous or nonspontaneous? At what temperature (if any) can the spontaneity be reversed? spontaneous, can be made nonspontaneous at 153 K spontaneous, cannot be made nonspontaneous at any temperature nonspontaneous, can be made spontaneous at 153 K nonspontaneous, cannot be made spontaneous at any temperature

Explanation / Answer

For the given reaction,

dGo = dHo -TdSo

with,

dGo = 0

T = dHo/dSo

   = 61.9/0.4054

   = 152.6 K

So,

C) the reaction is non-spontaneous and can be made spontaneous at 153 K

dGo is -ve at 153 K, and hence TdS term becomes -ve and greater than dHo value, reaction becomes sponatenous above 153 K.

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