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Question

A balloon containing 1 mole air at 1 atm initially is filled further with air till pressure increases to 4 atm. The initial diameter of the balloon is 1 m and the pressure at each stage is proportion to diameter of the ballon. How many no. of moles of air added to change the pressure from 1 atm to 4 atm


A

80

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B

257

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C

255

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D

256

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Solution

The correct option is C

255


Pd P = kd and k=1 atm1 metre

PV=nRT kd(16πd3) = nRT;

d41d42=n1n2; 144=n1/n2; n2=256

no. of moles added = 256 - 1 = 255


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