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In what way internal energy is different from enthalpu? Explain both the trms with suitable examples.

Answer» Internal energy: Every substance prossesses a certain definite amount of energy known as internal energy `(E)`. The internal energy of a substance depends upon its nature and also the conditions of temperature and pressure. Thus, different substances possess varying amounts of internal energies depending upon the conditions. For example, the internal energy of `1` mole of water is different at temperatures of `280 K` and `290 K`.
Enthalpy: The enthalpy of a system may be defined volume `(PV)` energy.
`H=E+PV`


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