Using bond-energy data,what is ΔH° for the following reaction?
CH₃OH(g) + H₂S(g) → CH₃SH(g) + H₂O(g)
Bond
Bond Energy (kJ/mol)
C-H
413
C-O
358
O-H
463
C-S
259
S-H
339

Question

Quizplus · Accepted Answer

To calculate ΔH° for the reaction, we sum the bond energies of the bonds broken and subtract the sum of the bond energies of the bonds formed. Bonds broken: C-O (358 kJ/mol) + S-H (339 kJ/mol) = 697 kJ/mol. Bonds formed: C-S (259 kJ/mol) + O-H (463 kJ/mol) = 722 kJ/mol. ΔH° = Bonds broken - Bonds formed = 697 kJ/mol - 722 kJ/mol = -25 kJ/mol.

Using Bond-Energy Data,what Is ΔH° for the Following Reaction