Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are -382.64 kJ mol⁻¹ and -146.5 J K⁻¹ mol⁻¹, respectively. Standard Gibb’s energy change for the same reaction at 298 K is:

Question

Accepted Answer

-339.3 kJ mol⁻¹. The Gibbs free energy change (ΔG) is calculated using the formula ΔG = ΔH - TΔS. Substituting the given values: ΔH = -382.64 kJ mol⁻¹, T = 298 K, and ΔS = -146.5 J K⁻¹ mol⁻¹ = -0.1465 kJ K⁻¹ mol⁻¹, we get ΔG = -382.64 - (298 × -0.1465) = -382.64 + 43.657 = -339.3 kJ mol⁻¹.

Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are -382.64 kJ mol⁻¹ and -146.5 J K⁻¹ mol⁻¹, respectively. Standard Gibb’s energy change for the same reaction at 298 K is:

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