Answer to Question #130183 in General Chemistry for A

Question

What is the definition of enthalpy change of reaction?Please choose the correct answer below:

A)The temperature change that happens during a reaction.

B)The difference between the enthalpy of the products and the enthalpy of the reactants.

C)The heat required to overcome the activation energy of a reaction.

D)The energy required to raise the temperature of 1 gram of water by 1 Kelvin.

Answer 1

Enthalpy of a reaction is defined as The difference between the enthalpy of the products and the enthalpy of the reactants.

Enthalpy is an energy term,so it cannot be a temperature difference.So ,(A) is incorrect.

Heat required to overcome activation energy( intermediate stage) of a reaction is not enthalpy of reaction as enthalpy of reaction is the difference between initial and final stage of reaction. So,option (C) is incorrect.

The energy required to raise the temperature of 1 gram of water by 1 Kelvin is known as specific heat .So,option (D) is wrong.

Hence the correct option is (B).