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Gibbs Free Energy & Spontaneity

In the reacti...

Question

In the reaction $A^{+} + B \to A + B^{+},$ there is no entropy change. If enthalpy change is 22 kJ of $A^{+}$ .
The $△ G$ for the reaction (in $k J$ ) is

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Solution

For the given reaction,
$△ H = 22 k J, △ S = 0$
$∴ F r o m, △ G = △ H - T △ S$
$△ G = 22 - T \times 0 = 22 k J$

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