Which of the following is not a state function?

One mole of a gas occupying $3 \ L$ volume is expanded against a constant external pressure of $1 \ bar$ to a volume of $15 \ L$. Calculate the work done by the system.

Explain the internal energy as a state function.

The number of extensive properties in the following list is: enthalpy,density,volume,internal energy,temperature.

Conditions of standard state used in thermochemistry is

Extensive properties depend on the quantity of matter,while intensive properties do not. Classify the following properties as extensive or intensive:
Mass,internal energy,pressure,heat capacity,molar heat capacity,density,mole fraction,specific heat,temperature,and molarity.