Question

1 mol H 2 O is present in a rigid, sealed 20-L container at 50°C and pressure P. An inventor has proposed a device that can increase the P (through ultrasonic excitation of the molecules) at constant T inside the vessel, and without a reaction taking place. Is this possible?

Answer 1

No, it is not possible. Because when we provide ultrasonic excitation to the molecules , the energy level of molecules got increases. But as the question is pressure increases without any change in temperture is not possible. When we give energy to the system the temperature got increases and also the volume of molecules got increases. But the volume of container or vessel is constant so ultimately pressure got increases in the vessel. But the temperature will not remain constant.