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InterviewSolution
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Standard enthalpy and standard entropy changes for the oxidation of ammonia at `298 K` are `-382.64 kJ mol^(-1)` and `-145.6 jK^(-1)mol^(-1)` respectively. Standard Gibbs energy change for the same reaction at `298 K` isA. `-523.2 kJ mol^(-1)`B. `-22.1 kJ mol^(-1)`C. `-339.3 kJ mol^(-1)`D. `-439.3 kJ mol^(-1)` |
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Answer» Correct Answer - C `NH_(3)(g)+(3)/(4)O_(2)(g)to(1)/(2)N_(2)(g)+(3)/(2)H_(2)O(l)` `T=298 K` `DeltaH=-382.64 kJ mol^(-1)` `DeltaS=-145.6 JK^(-1) mol^(-1)` `=-0.1456 kJ K^(-1) mol^(-1)` `DeltaG=DeltaH-TDeltaS` `=-382.64 kJ mol^(-1)-(298 K)xx(0.1456 k JK^(-1)mol^(-1))` `=-382.64 kJ mol^(-1)+43.3888 kJ mol^(-1)` `=-339.25 kJ mol^(-1)` |
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