Gaseous StateHard

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 cm3 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 :

Options

A.75 cm3
B.125 cm3
C.150 cm3
D.250 cm3

Solution


   VA = 100           VB = V ml
          ml
PA VA = PA′ V′       Where  V′ = VA + VB = (VA + V) ml
PA 100 = PA × V′    PA = PA
250 = V′     ⇒  VA + V = 250 ml
                                  V = 150 ml

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