Question

in a synthesis reaction one reactant contains 346 j of chemical energy and one reactant contains 153 j of chemical energy. the product contains 435 j of chemical energy. because energy is conserved. what energy change occurs during the reaction? a) 64 j of energy is released b) 242 j of energy is absorbed c) 64 j is absorbed d) 242 j of energy is released

Answer 1

Energy of reactants + energy absorbed = energy of the products

Energy absorbed = energy of the products - energy of the reactants

Energy absorbed = 435 J - (346 J + 153 J) = 435 J - 499 J = -64 J

The negative sign means that the energy was released instead of absorbed.

Then the answer is the option a).