Question

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

Delta.Hsystem = –345 kJ, T = 293 K, Delta.Ssystem = 465 J/K
Delta.Gsystem = Delta.Hsystem – TDelta.Ssystem
–481 kJ
–209 kJ
413 kJ
135,900 kJ

Answer 1

ΔG = ΔH − TΔS = (−345 kJ) − (293 K)(465 J/K × 1 kJ/1000 J)
= −345 kJ − 293×0.465 kJ
= −345 kJ − 136.245 kJ ≈ −481 kJ.

Answer: −481 kJ.