Reactant cap p contains 50 cap j of energy, and reactant cap q contains 35 point 3 cap j of energy. The reactants combine to form product PQ , which contains 104 cap j of energy. What is the energy transformation?
Answer
A
Energy is lost because the product has less energy than the reactants have.
B
Energy is absorbed because the product has less energy than the reactants have.
C
Energy is absorbed because the product has more energy than the reactants have.
D
Energy is lost because the product has more energy than the reactants have.
Explanation
Add the energy in the reactants: 50 kJ + 35.3 kJ = 85.3 kJ. The product contains 104 kJ, which is 18.7 kJ more than the reactants. That extra energy must have been absorbed, so the correct choice is “Energy is absorbed because the product has more energy than the reactants have.”
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