The work done during the expansion of $1 \ mol$ of an ideal gas into a vacuum is ............ .

At equilibrium,all systems are closed systems. $A$ saturated solution of glucose in an open vessel is which type of system?

Name the energy which arises due to the motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?

If $0.75 \ mol$ of an ideal gas expands isothermally at $27 \ ^{\circ}C$ from $15 \ L$ to $25 \ L$,the maximum work obtained is ...... $J$. (in $.5$)

When a system goes from state $A$ to state $B$,the change in internal energy is $40 \, kJ/mol$. If the system returns from state $B$ to state $A$ via a reversible path and then returns to state $A$ via an irreversible path,what is the net change in internal energy?

Which of the following is always negative for an exothermic reaction?