Which of the following is an example of an intensive property of the system?

At $T(K)$, $2 \ mol$ of an ideal gas is allowed to expand reversibly and isothermally from a pressure of $10 \ atm$ to $1 \ atm$. The work done (in $kJ$) is $(R=8.3 \ J \ K^{-1} \ mol^{-1})$.

Fill in the blanks:
$(i)$ $A$ system that allows the exchange of energy but not matter with the surroundings is called a ........ .
$(ii)$ The total amount of energy consisting of the internal energy of a substance plus the product of its pressure and volume is called ........ .
$(iii)$ The change in energy that occurs when a chemical reaction is carried out at constant pressure is called ........ .

One mole of an ideal gas at $300 \ K$ is expanded isothermally from an initial volume of $1 \ L$ to $10 \ L$. The change in internal energy for this process is ....... $cal$ $(R = 2 \ cal \ mol^{-1} \ K^{-1})$

Which of the following are extensive properties?
$(A)$ Heat capacity
$(B)$ Entropy
$(C)$ Gibbs' energy
$(D)$ Concentration
$(E)$ Vapour pressure

Which of the following is an isolated system?