A chemical reaction has a change in enthalpy of 1352 kJ/mol and a total bonding energy of the recants is 1546 kJ/mol. Calculate the total bonding energy of the products and decide whether the reaction is endothermic or exothermic

A) 84 kJ/mol, endothermic

B) 194 kJ/mol, endothermic

C) 84 kJ/mol, exothermic

D) 194 kJ/mol, exothermic

Answer is: D) 194 kJ/mol, exothermic

ΔHreaction = ∑ (product bond energies) - ∑ (reactant bond energies).

∑ (product bond energies) = ΔHreaction + ∑ (reactant bond energies).

ΔHreaction must be negative (exothermic) if ∑ (product bond energies) is positive.

∑ (product bond energies) = - 1352 kJ/mol + 1546 kJ/mol.

∑ (product bond energies) = 194 kJ/mol.

∑ is summation.