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Coulomb's Law and lattice energy

Submitted by chemquiz411 on Wed, 12/02/2009 - 19:48

Calculate the amount of energy released in the formation of one mole of MgSe bonds (not lattice energy). The radius of the magnesium ion is 1.60 A, and the radius of the selenide ion is 1.26 A. Note that 1A=10-10m.

I calculated the distance in meters to be 2.86 X 10-10m

Product of charges to be -4

But I cannot find the energy released. Please Help. I have already pluged into E=kq1q2/d, and got a negative product, but the product must be positive.

sign of energy will be negative because it is the energy released.