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Question

X2O4(l)2XO2(g), ΔU=2.1 kcal
ΔS=20 calK1 at 300 K. Then ΔG is:

A
2.7 kcal
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B
-2.7 kcal
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C
9.3 kcal
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D
-9.3 kcal
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Solution

The correct option is B -2.7 kcal
The given reaction is,
X2O4(l)2XO2(g)Δng=20=2
Again given,
ΔU=2.1 kcalΔS=20 calK1T=300 K
We know,
ΔH=ΔU+ΔngRT =2.1×1000+2×2×300 =2100+1200 =3300 cal
Again,
ΔG=ΔHTΔS =3300300×20 =33006000 =2700 cal or 2.7 kcal

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