Calculate the standard free-energy change at 25 ∘c for the following reaction:
mg(s)+fe2+(aq)→mg2+(aq)+fe(s)
express your answer to three significant figures and include the appropriate units.

Explanation:

The given reaction is:

The two half reactions and their half potentials are as follows:

E° = -2.37 V

E° = -0.44 V

Half cell with more negative potential will act as anode and half cell with less negative potential will act as cathode.

Calculate cell potential as follows:

Formula for the calculation of standard free energy is as follows:

F = 96500 c/mol

n for the given reaction is 2.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.