First slide

Gibb's Helmholtz equation

Question

At 0⁰C ice and water are in equilibrium and ΔH = 6.0kJ, then ΔS will be

Moderate

A

22JK^–1mol^–1
B

35JK^–1mol^–1
C

48JK^–1mol^–1
D

100JK^–1mol^–1

Solution

At equilibrium , $\Delta G = \Delta H - T\Delta S = 0$
$\begin{array}{l} \Delta H = T\Delta S\\\\ 6 \times 1000 = 273\Delta S\\\\ \Delta S = \frac{{6000}}{{273}} = 21.97 \approx 22J/K/mole \end{array}$

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