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Question

Calculate fGoin kJmol1 for (NH4Cl,s) at 310 K.
Given : fHo(NH4Cl,s)=314.5 kJmol1; rCp=0

SoN2(g)=192 JK1 mol1; SoH2(g)=130.5 JK1 mol1;
SoCl2(g)=233 JK1 mol1; SoNH4Cl(s)=99.5 JK1 mol1

All given data are at 300 K.

A
198.56
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B
426.7
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C
202.3
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D
None of these
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Solution

The correct option is A 198.56
Given : fHo(NH4Cl,s)=314.5 kJ/mol; rCp=0

SoN2=192 JK1 mol1; SoH2=130.5 JK1 mol1;

SoCl2=233 JK1 mol1; SoNH4Cl=99.5 JK1 mol1

fSo(NH4Cl, s) at 300 K

=SNH4Cl(s)[12SN2(g)+2SH2(g)+12SCl2(g)]
=374 JK1 mol1


fCP=0

fSo310=fSo300
=374 JK1 mol1

fHo310=fHo300=314.5
Go310=fHo310 So
=314.5310(374)1000=198.56 kJ/mol.

hence, fGo=198.56 kJmol1

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