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label Chemistry
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Use the given average bond energy values to estimate ΔH for the following reaction in the gas phase. 

H2 + F2 → 2HF

DH-H = 432 kJ/mol
DF-F = 154 kJ/mol
DH-F = 565 kJ/mol
Nov 1st, 2014

Hess' Law for bond enthalpies is:

ΔHrxn = Σ Ereactant bonds broken minus Σ Eproduct bonds broken

=(432+154)-(2*565)

=-544 kJ/mol


Nov 1st, 2014

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