The quantity U + PV is known as the enthalpy of the system. It is denoted by H. It represents the total energy stored in the system. Thus H = U + PV Where U is a definite property P and V are also definite properties Hence H is ...

Change of internal energy in a chemical reaction: The energy associated with the random, disordered motion of molecules is called Internal energy. Internal energy is a state property i.e. its value depends only upon the state of the substance but does not depend upon how that ...

The chemical reactions which take place with energy changes are known as thermochemistry. A thermochemistry deal with energy changes and it is a branch of chemistry. The energy changes occur mostly due to change of bond energy. Thermochemistry deals with two types of chemical reaction: 1. ...