"Internal energy is a state function." Explain.

Explanation

Internal energy (E): "The total energy stored in the substance at constant temperature and pressure is called its internal energy (E).
It is a state function and is an extensive property.
Internal energy change `(triangleE)` is considered as the difference between the internal energies of products and reactants.
`triangleE=(E_(p)-E_(r))`
In any path taken (Q-W).is equal to `triangleE.`
Where Q= heat and W= Work.
Intemal energy is a state function it depends on initial state and find state of the system.