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Question

The difference in Δ H and ΔU for the combustion of solid benzoic acid at 300 K is equal to:

A
1.247 kJ
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B
+1.247 kJ
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C
2.247 J
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D
2.247 J
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Solution

The correct option is D 1.247 kJ
Solution:- (A) 1.247kJ
Combustion of benzoic acid
C6H5COOH(s)+152O2(g)7CO2(g)+3H2O(l)
Δng=nPnR=7152=12
T=300K(Given)
Now, as we know that,
ΔH=ΔU+ΔngRT
ΔHΔU=(12)×8.314×300
ΔHΔU=1247.1J=1.247kJ
Hence the difference in ΔH and ΔU for the combustion of solid benzoic acid at 300K is 1.247kJ.

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