AP EAMCET202317 May 2023Morning ShiftChemistryThermodynamics (C)Actual
If the enthalpy and entropy change for a reaction at 298 ~K are -145 ~kJ ~mol ⁻¹ and -650 ~J ~K ⁻¹ ~mol ⁻¹ respectively, which one of the following statements is correct?
Options
- AG =-50 ~kJ ~mol ⁻¹ , the reaction is spontaneous
- BG =-48.7 ~kJ ~mol ⁻¹ , the reaction is non-spontaneous
- CG =+50 ~kJ ~mol ⁻¹ , the reaction is spontaneous
- DG =48.7 ~kJ ~mol ⁻¹ , the reaction is non-spontaneous
Correct answer
D. G =48.7 ~kJ ~mol ⁻¹ , the reaction is non-spontaneous
Step-by-step solution
G = H - T S We have, H =-145 ~kJ ~mol ⁻¹ and S =-650 ~J ~K ⁻¹ ~mol ⁻¹ G = (-145 ~kJ ~mol ⁻¹ )-298 (-650 10⁻³ ~kJ . . mol ⁻¹ k ⁻¹ )=+48.7 ~kJ ~mol ⁻¹ and the reaction is nonSpontaneous.