He gas is contained in a one-liter flask that is connected to an empty one-liter flask with a closed stopcock between the two flasks.When the stopcock is opened some of the He enters the evacuated flask.For this system

Question

Quizplus · Accepted Answer

When the stopcock is opened, the gas will move from the flask with higher pressure to the one with lower pressure. This process is irreversible and leads to an increase in disorder or entropy. Therefore, ΔS is positive. As there is no change in temperature, the change in enthalpy or heat content (ΔH) is zero. Hence, option B is the correct answer.

He Gas Is Contained in a One-Liter Flask That Is