Physical Chemistry- Calculating Gibbs Free energy for Adiabatic Process

Question

For adiabatic process in a Carnot Engine, we know that Q=0. However, in terms of calculating Delta G aka (Gibbs Free Energy which is dG=H-TdS). We cannot cancel TdS despite dS being zero so how would we solve for DG for adiabatic process?

Answer 1

∆S is NOT zero for all adiabatic processes. It IS zero for an adiabatic process that is reversible, but this problem doesn't give enough information to determine if the reaction in question is reversible or not. If not reversible, ∆H ≠ 0

NOTE: After re-reading the question, I guess the Carnot Engine is a theoretical construct that would be a reversible reaction, so my original comment may not be valid here. Not sure how to find ∆G