Question

The change in heat energy of a chemical reaction at constant temperature and pressure is called:

• A. enthalpy
• B. free energy
• C. internal energy
• D. bond energy

Answer 1

Answer: (A)

The change in heat energy of a chemical reaction at constant temperature and pressure is called enthalpy. Mathematically it is the sum of internal energy and the pressure volume energy.
$H=E+PV$