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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 -45.6 JK^-1 mol^-1, respectively.

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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 -45.6 JK-1 mol-1, respectively. Standard Gibb's energy change for the same reaction at 298 K is

(a) -22.1 kJ mol-1

(b) -339.3 kJ mol-1

(c) -439.3 kJ mol-1

(d) -523.2 kJ mol-1

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Correct answer: (b) -339.3 kJ mol-1

Explanation:

ΔG = ΔH - TΔS

= -382.64 - (298 x 145.6 x 10-3)

= -339.3 kJ mol-1

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