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April 1, 2015

Homework Help: Chemistry

Posted by Rob on Saturday, December 8, 2012 at 8:30pm.

Use the data given below to construct a Born - Haber cycle to determine the electron affinity of Br?
DH°(kJ)
K(s) → K(g) 89
K(g) → K⁺(g) + e⁻ 419
Br2(l) → 2 Br(g) 193
K(s) + 1/2 Br2(g) → KBr (s) -394
KBr(s) → K⁺(g) + Br⁻(g) 674

I know the answer is -325 kj, I want to know how to get it. Thanks

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