Answer to Question #340849 in Physical Chemistry for Sena

Question

What is amount of energy released in the formation of one mole of SrO bonds . The radius of stronium ion is 113pm and the radius of the oxide ion is 140pm?

Answer 1

I know I need to use the formula E=k(q1*q2)/d

Honestly don't know where to begin. So far i got 2+|-2|=4meters and that would be the q1+q2. However, i'm not sure how to solve for D or where the 1Å=10^-10 is supposed to go... any help or direction would be greatly appreciated.