Which of the following is an extensive property of a system?

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

What is the constant external pressure of an ideal gas when expanded from $2 \times 10^{-2} \ m^3$ to $3 \times 10^{-2} \ m^3$,if the work done by the gas is $-5.09 \ kJ$?

For a phase change$H _2 O ( l ) \underset{1 bar , 0^{\circ} C }{\rightleftharpoons} H _2 O ( s )$

Exothermic reactions occur in which of the following processes?

Choose the reaction in which $\Delta H$ is not equal to $\Delta U$.