For a massless piston undergoing an expansion of $\Delta V$ at constant temperature against a variable external pressure $P$,which equation represents the work done?

Which of the following is not a state function?

The process,in which no heat enters or leaves the system,is termed as

What is the work done when $2 \text{ mole}$ of an ideal gas are expanded isothermally and reversibly from $5 \text{ m}^{3}$ to $10 \text{ m}^{3}$ at $300 \text{ K}$ (in $\text{ kJ}$)? $(R=8.314 \text{ J K}^{-1} \text{ mol}^{-1})$

Identify the equation in which the change in enthalpy is equal to the change in internal energy.

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