On what factors does the enthalpy of dilution of a solution depend?

The change in internal energy $\Delta U$ of an ideal gas depends on:

The number of extensive and intensive properties in the following list is respectively: Mass,temperature,pressure,enthalpy,heat capacity,internal energy,density.

Identify the pair in which both are not extensive properties.

Enthalpy change for freezing of $1 \ g$ of water at $1 \ bar$ and $0^{\circ} C$ is $334 \ J$. Calculate the internal energy change in $J$ when $1 \ g$ of water is converted into ice?

The enthalpies of the elements in their standard states are assumed to be