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Gibbs Free Energy & Spontaneity

The free ener...

Question

The free energy for a reaction having $Δ H = 31400 c a l, Δ S = 32 c a l K^{- 1} {m o l}^{- 1}$ at $1000^{o} C$ is:

A

- 9336 c a l

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B

- 7386 c a l

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C

- 1936 c a l

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D

+ 9336 c a l

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Solution

The correct option is A $- 9336 c a l$
We have,
$Δ G = Δ H - T Δ S$
$Δ G = 31400 - 1273 * 32 = - 9336 c a l$

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