If in a container neither mass nor heat exchange occurs,then it constitutes a

Which of the following transformations is endothermic in nature?

The evaporation of water is a:

An ideal gas expands by $1.5 \ L$ against a constant external pressure of $2 \ atm$ at $298 \ K$. Calculate the work done (in $J$)?

Explain the internal energy as a state function.

$A$ system is changed from state $A$ to state $B$ by one path and from $B$ to $A$ by another path. If $E_1$ and $E_2$ are the corresponding changes in internal energy,then: