The enthalpy change for a process and its reverse are related by:
a) ΔHfₒᵣwₐᵣd =ΔHᵣₑᵥₑᵣₛₑ
b) ΔHfₒᵣwₐᵣd =−ΔHᵣₑᵥₑᵣₛₑ
​c) ΔHfₒᵣwₐᵣd =TΔSfₒᵣwₐᵣd
d)ΔHfₒᵣwₐᵣd =TΔSᵣₑᵥₑᵣₛₑ