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Question

Two glass bulbs of equal volumes are connected by a narrow tube and are filled with an ideal gas at 0C and a pressure of 76 cm of mercury. One of the bulbs is then placed in a water bath maintained at 62C. What is the new value of the pressure inside the bulbs?

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Solution

Initially, when both bulbs are at 273 K. The mole in each bulb,
=Total mole2=P.2V2RT=PVRT=76×VR×273
On heating second bulb some mole of gas is transferred to the bulb.
For bulb 1n1=P1×VR×273
For bulb 2n1=P2×VR×335
Since n=n1+n2
76×VR×273×2=P1×VR×273+P2×VR×335
Also P1=P2
P1=83.75cmHg

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