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Entropy

The standard ...

Question

The standard entropies of $C O_{2} (g), C (s) a n d O_{2} (g)$ are $213.50, 5.74$ and $205 J / K$ respectively. The standard entropy of formation of $C O_{2}$ is.

A

- 2.76 J / K

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B

5.76 J / K

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C

2.76 J / K

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D

- 5.76 J / K

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Solution

The correct option is C $2.76 J / K$
The reaction taking place is
$C (s) + O_{2} (g) \to C O_{2} (g)$

We know,
$Δ S = \sum S_{p r o d u c t s} - \sum S_{r e a c t a n t s}$

here in this case of formation of $C O_{2}$ ,
putting the values,
$Δ S = [213.50] - [5.74 + 205]$
$= 2.76 J / K$

Theory:
Entropy change for a reaction is given as:
$Δ S = S_{f i n a l} - S_{i n i t i a l}$

$Δ S = \sum S_{p r o d u c t s} - \sum S_{r e a c t a n t s}$

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