The reaction H₂(g) + I₂(g) → 2 HI(g) has a measured standard enthalpy change of +26 kJ mol⁻¹ at 298 K. Using the average bond energies H–H 436 kJ mol⁻¹ and I–I 151 kJ mol⁻¹, which of the following is the best estimate for the average H–I bond energy in kJ mol⁻¹?
a) 4.36×102kJ mol−1
b) 2.0×102kJ mol−1
c) 2.8×102kJ mol−1
d) 3.06×102kJ mol−1