Question

Can we reverse the combustion reaction of dihydrogen?

Answer 1

What you are asking is whether we can reverse the combustion reaction of dihydrogen. The answer is yes.

Explanation:

`H_2(g) + 1/2O_2(g) rarr H_2O(g) + Delta`

This reaction may be driven to the left (and it is usually done in the lab by electrolysis). However, every law of thermodynamics dictates that you can't get the energy out that was put in.