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Question

For a reaction at 25C enthalpy change (ΔH) and entropy change (ΔS) are 11.7×103Jmol1 and 105Jmol1K1 respectively. The reaction is:

A
spontaneous.
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B
non spontaneous.
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C
at equilibrium.
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D
can't say anything.
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Solution

The correct option is B non spontaneous.
Spontaneous reactions have negative free energy change and non spontaneous reactions have positive free energy change.
ΔG=ΔHTΔS.
Substitute values in the above expression.

ΔG=11.7×103Jmol1298K×105Jmol1K1=19590Jmol1
Since, the gibbs free energy change is positive, the reaction is non spontaneous.

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