Asked by myles

The bond enthalpy of F2(g) is 156.9 kJ/mol. Calculate ÄH°f for F(g).
1 kJ/mol
Answered by DrBob222
Wouldn't it just be 1/2 of 156.9?
Answered by M
F2 (g) ------> 2F (g)
so deltaHrxn = +156.9/2 = 78.45 kJ/mol

you need to divide by 2 because 156.9 kJ/mol you need to from 2 F-atoms, and you need to prorate per one atom.