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Gibb's Energy and Nernst Equation

The change in...

Question

The change in entropy for a system and surrounding are $- 0.228 J K^{- 1}$ and $+ 0.026 J K^{- 1}$ respectively. Then entropy change of the universe is:

A

- 0.202 J K^{- 1}

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B

+ 0.202 J K^{- 1}

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C

+ 0.877 J K^{- 1}

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D

- 0.877 J K^{- 1}

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Solution

The correct option is A $- 0.202 J K^{- 1}$
$Δ S_{U n i v} = Δ S_{S y s t} + Δ S_{S u r r}$
$Δ S_{U n i v} = - 0.228 J / K + 0.026 J / K = - 0.202 J / K$
The entropy change of the universe is $- 0.202 J / K$

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