Two glass bulbs A and B are connected by a very small tube having a stop-cock. Bulb A has a volume of 100 c m 3 and contained the gas; while bulb B was empty. On opening the stop-cock, the pressure fell down to 40%. The volume of the bulb B must be

Question

Two glass bulbs A and B are connected by a very small tube having a stop-cock. Bulb A has a volume of 100 c m 3 and contained the gas; while bulb B was empty. On opening the stop-cock, the pressure fell down to 40%. The volume of the bulb B must be, 75 c m 3, 125 c m 3, 150 c m 3, 250 c m 3

MARKS App · Accepted Answer

P 1 = 1 atm P 2 = 1 atm × 40 100 = 0.40 atm V 1 = 100 c m 3 V 2 = ? At constant temperature, P 1 V 1 = P 2 V 2 So V 2 = P 1 V 1 P 2 - 1 atm × 100 c m 3 0.40 atm = 250 c m 3 Hence, the volume of bulb B = 250 − 100 cm 3 = 150 cm 3

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