Question

What is Delta.Gsystem for the system that is described by the following data?

Delta.Hsystem = –232 kJ, T = 293 K, Delta.Ssystem = 195 J/K
Delta.Gsystem = Delta.Hsystem – TDelta.Ssystem
–289 kJ
–175 kJ
256 kJ
56,903 kJ

Answer 1

First convert entropy to kJ/K: 195 J/K = 0.195 kJ/K.

Then ΔG = ΔH − TΔS = −232 kJ − (293 K)(0.195 kJ/K) = −232 kJ − 57.135 kJ = −289.135 kJ ≈ −289 kJ.

Answer: −289 kJ.