PLEASE HELP I NEED THE ANSWER ASAP How can the overall enthalpy of reaction be calculated when intermediate reaction steps are present?

Temperature is defined as a. the equivalent of heat. b. a measure of the average kinetic energy of the individual atoms or molecules composing a substance. c. how hot or cold it is. d. the total kinetic energy of the atoms or molecules composing a substance. e. none of the above is correct.