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Q.

At 270C, a closed vessel contains a mixture of equal weights of helium (mol. wt = 4), methane (mol.wt = 16) and sulphur dioxide (mol. wt = 64). The pressure exerted by the mixture is 210 mm. If the partial pressures of helium, methane and sulphurdioxide are P1, P2 and P3 respectively, which one of the following is correct?

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a

P3 > P2 > P1

b

P1 > P2 > P3

c

P1 > P3 > P2

d

P2 > P3 > P1

answer is B.

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Detailed Solution

Partial pressures of each gas is directly proportional to the number of moles  the gas present in the mixrure.Since equal weights are taken number of moles is inversely proportional to gram molecular weight.
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At 270C, a closed vessel contains a mixture of equal weights of helium (mol. wt = 4), methane (mol.wt = 16) and sulphur dioxide (mol. wt = 64). The pressure exerted by the mixture is 210 mm. If the partial pressures of helium, methane and sulphurdioxide are P1, P2 and P3 respectively, which one of the following is correct?