Question

Among the following enthalpies, which is always less than zero?

• A. ∆_mixH^o
• B. ∆_iH^o
• C. ∆_subH^o
• D. ∆_cH^o

Answer 1

The correct option is D

∆_cH^o

Among the given parameters only ∆_cH^o is always less than 0 because the process of combustion is always exothermic.