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

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

J & K CETJ & K CET 2000

Solution:

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 $