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Question

The standard entropies of CO2(g), C(s) and O2(g) are 213.50, 5.74 and 205 J/K respectively. What will be the standard entropy of formation of CO2:

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)+O2(g)CO2(g)

We know,
ΔS=SproductsSreactants

here in this case of formation of CO2,
putting the values,
ΔS=[213.50][5.74+205]
=2.76 J/K

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