Question

what is enthalpy and entropy?

Answer 1

Enthalpy may be defined as the energy supplied to the system or gain from the system at constant pressure. Mathematically it is called the sum of internal energy and pressure-volume work.

H = U + PV

Entropy may be defined as the measurement of disorderness or randomness in a system. It is denoted by S. For any reversible reaction the change in entropy may be defined as ratio of energy Q and Temperature T.

ΔS = Q/ΔT.