Question

A glass bulb A and B are connected by a very small tube having a stop cock. Bulb A has a volume of 100 ml and contained the gas while bulb B was empty. On opening the stop cock, the pressure fell down to 40%. Assuming the temperature remains constant, the volume of the bulb B must be

• A. 40 ml
• B. 60 ml
• C. 150 ml
• D. 260 ml

Answer 1

The correct option is C 150 ml

In the process of opening the stop cock, the total number of moles of gas does not change.
Let the initial pressure = P
Final pressure = 0.4P
Since moles are constnat, P(0.1 L) = 0.4P(0.1 + $V_B$ )
Solving $V_B$ = 0.15L = 150 m L