Question

What is Delta.Grxn for the equation below?

NaOH(aq) + HCl(aq) Right arrow. H2O(l) + NaCl(aq)

Delta.Hrxn = -56.13 kJ
Delta.Srxn = 87.1 J/K
T = 303 K
Use Delta.G = Delta.H – TDelta.S.
–82.5 kJ
–29.7 kJ
26,500 kJ
27,000 kJ

Answer 1

Convert ΔS to kJ/K: 87.1 J/K = 0.0871 kJ/K.
TΔS = 303 K × 0.0871 kJ/K = 26.39 kJ.
ΔG = ΔH − TΔS = −56.13 kJ − 26.39 kJ = −82.52 kJ ≈ −82.5 kJ.

Answer: −82.5 kJ.