Only (B) and (C) are correct. (B) G=H−TS At constant T ∆G=∆H−T∆S (A) First law is given by ∆U=Q+W If we apply constant P and reversible work. ∆U=Q−P∆V (C)By definition of entropy change dS=‌
dq‌q‌rev ‌
T
At constant T ∆S=‌
q‌rev ‌
T
(D) H=U+PV For ideal gas H=U+nRT At constant T ∆H=∆U+∆nRT