Use the tabulated half-cell potentials to calculate ΔG° for the following redox reaction. 2 Al(s) + 3 Mg2+(aq) → 2 Al3+(aq) + 3 Mg(s)

+6.8 x 102 kJ
-7.8 x 102 kJ
+4.1 x 102 kJ
+1.4 x 102 kJ
-2.3 x 102 kJ
Answer is 4.1-10^2 kJ

Please explain every details

When I did it, I got the potential energy -2.37+(-1.66)=-4.03

screening

explanation:

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

it is the most commonly accepted one