Statement -1:  Two vessels A and B are connected to each other by a stopcock. Vessel A Contains a gas at 300 K and 1 atmosphere pressure and vessel B is evacuated. The two vessels are thermally insulated from the surroundings. If the stopcock is suddenly opened, the expanding gas does no work.

Statement -2 :  Since $\Delta Q=\text{ 0}$ and $\Delta U\text{ = 0}$, it follows from the first law of thermodynamics that $\Delta W\text{ = 0}$.