Which of the following things can be determind for a reac-tion that is a combination of two half-reaction of known standard potential?

Options

A. Standard potential
B. Standard Gibbs energy change
C. Equilibrium constant
D. All of these

Answer

D

Explanation

We can calculate a numerical value for the standard potentail of any reaction that is a combination of two half-reactions of know staandard potential. The standard potential of the overall reaction is the listed potential of the half-reaction that occurs as a reduction minus the liste potential of the half-reaction that occurs as the oxidation. We subtract, rather than add the potentials because the series list only reduction half-reactions.
`E_("reactions")^(@) = E_("reducation")^(@) - E_("oxidation")^(@)`
We can also use the sign of `E^(@)` to determine the spontaneous direction of the reaction when all the substance in it are in their standard states. The reation is spontaneous from left to right when `E^(@)` is positive and from right to left when `E^(@)` is negative.