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Gibbs Free Energy & Spontaneity

CaCO3s→ CaOs+...

Question

$C a {C O}_{3 (s)} \to C a O_{(s)} + {C O}_{2 (g)}$ $Δ H = + 180 K J$
If entropies of limestone, lime and carbon dioxide are $93, 39$ and $213 J / m o l / K$ . Then $Δ S_{t o t a l}$ in ${J K}^{- 1}$ at $300 K$ is:

159

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- 441

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700

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Solution

The correct option is A $159$
$△ S_{t o t a l} = △ S_{p r o d u c t s} - △ S_{r e a c t a n t s}$
$= △ S_{C a O} + △ S_{C O_{2}} - △ S_{C a C O_{3}}$
$= 39 + 213 - 93$
$= 159$

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