When $2 \ L$ of an ideal gas expands isothermally into a vacuum to a total volume of $6 \ L$,what is the change in internal energy in $J$? (Nearest integer)

Which of the following is not true?

Which of the following processes involves zero work done?

It is a general principle that the less energy a system contains,it is:

The volume of $100 \ L$ of gas increases to $120 \ L$ at a constant temperature and an external pressure of $10 \ bar$. Calculate the work done by the system. [Given: $1 \ L \ bar = 24.21 \ cal$] (in $cal$)

Consider the expansion given in problem $6.2$,for $1 \, mol$ of an ideal gas conducted reversibly.