Out of molar entropy $(I)$,specific volume $(II)$,heat capacity $(III)$ and volume $(IV)$,which are extensive properties?

$A$ certain mass of a gas was brought from state $A$ to $B$ by following three different paths,namely $1$,$2$ and $3$,respectively. Which of the following relations is correct for the work done?

$A$ gas is allowed to expand against a constant external pressure of $2.5 \ bar$ from an initial volume of $2.5 \ L$ to a final volume of $4.5 \ L$. What is the amount of work done (in $J$)?

Which one of the following reactions has $\Delta H = \Delta U$?

Two moles of an ideal gas is expanded isothermally from a volume of $300 \ cm^3$ to $2.5 \ dm^3$ at $298 \ K$ against a constant pressure of $1.9 \ bar$. Calculate the work done in joules. (in $J$)

Predict the change in internal energy for an isolated system at constant volume.