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A mixture of one mole each of H2, He and O2 each are enclosed in a cylinder of volume V at temperature T. If the partial pressure of H2 is 2 atm, the total pressure of the gases in the cylinder is -

1. 14 atm
2. 22 atm
3. 38 atm
4. 6 atm

Correct answer: 6 atm

Solution

With one mole each, all partial pressures are equal; since p(H2) = 2 atm, total = 3 x 2 = 6 atm.

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