g(s)= 147.7 kJ/mol Eea for F(g)= −328 kJ/mol Bond dissociation energy for F2(g)= 158 kJ/mol Ei1 for Mg(g)= 737.7 kJ/mol Electrostatic interactions in MgF2(s)= −2957 kJ/mol Ei2 for Mg(g)= 1450.7 kJ/mol
Hey there! Here is the equation we will be using since we want net energy change:
Net energy = ΔH sublimation + 2(E electron affinity of F) + bond dissociation of F2 + E 1st ionization of Mg + E 2nd ionization of Mg + E of electrostatic interactions of MgF2
When you plug in all the given values, you should get an answer of -1118.9 kJ
Note that we multiplied the Energy of electron affinity of F by 2 because we have 2 moles of F in the reaction, but the value given is only for 1 mole.
Hope this helps!