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 is:

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Correct answer: B. -339.3 ~kJ ~mol ⁻¹

G = H - T S =-382.64-298 ( -145.6 1000 ) aligned & =-382.64+43.38 & =-339.3 ~kJ ~mol ⁻¹ aligned Related Theory Free energy is an extensive quantity, but the standard free energy is an intensive quantity.

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 is:

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