Two vessels A and B are connected via stopcock. Vessel A is filled with a gas at a certain pressure. The entire assembly is immersed in water and allowed to come to thermal equilibrium. After opening

Question

Two vessels A and B are connected via stopcock. Vessel A is filled with a gas at a certain pressure. The entire assembly is immersed in water and allowed to come to thermal equilibrium. After opening the stopcock the gas expands into vessel B and no change in temperature is observed. Which of the following statement is true?

Canvas Classes · Accepted Answer

Strategy:
 Analyze the expansion into an identical connected vessel without temperature change. This is characteristic of an ideal gas undergoing free expansion into a vacuum.

Step 1: Evaluate the conditions
Since  for an ideal gas expansion, and no work is done against external pressure (), it implies  and . This can only occur if Vessel B was initially evacuated.

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