Question

The total bonding energy for the products of a reaction is 2535 kJ/mol and the bonding energy of the reactants is 1375 kJ/mol. Calculate the change in enthalpy, and classify the reaction as endothermic or exothermic.

Answer 1

change in enthalpy= -1160
the reaction is exothermic as enthalpy change is negative

Answer 2

Answer is: 1160 kJ/mol, endothermic.

the change in enthalpy = the total bonding energy for the products of a reaction - the bonding energy of the reactants.

the change in enthalpy = 2535 kJ/mol - 1375 kJ/mol.

the change in enthalpy = 1160 kJ/mol.

There are two types of reaction:

1) endothermic reaction (chemical reaction that absorbs more energy than it releases).

2) exothermic reaction (chemical reaction that releases more energy than it absorbs).