Two moles of an ideal gas expand freely and isothermally from $5 \ dm^3$ to $50 \ dm^3$. What is the value of $\Delta H$?

When $2 \ mol$ of an ideal gas undergoes spontaneous expansion in a vacuum,the work done is ...... Joules.

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

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

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.

Two moles of an ideal gas expand spontaneously into a vacuum. The work done is ............. $Joule$.