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

Question

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

(A) dw 0
(B) dU 0
(C) The pressure in the vessel B before opening the stopcock is zero
(D) dq 0

Prashant Kotian · Accepted Answer

Correct answer: C. No gas in vessel B initially  pressure in the vessel B before opening the stopcock is zero. dw < 0 (expansion), dU = 0 (isothermal) So dq > 0 (from 1st law).

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