Q48 / 180 · NEET 2020 (Phase 1) · Chemistry

A mixture of N2 and Ar gases in a cylinder contains 7 g of N2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N2 is:
[Use atomic masses (in g mol–1): N=14,Ar=40]

  • A
    12 bar
  • Correct answer
    B
    15 bar
  • C
    18 bar
  • D
    9 bar

Solution

Mass of N2 = 7 g

Moles of N2=728=14

Mass of Ar=8 g

Moles of Ar=840=15

Partial pressureN2=PT×mole fractionN2

=27×1/41/4+1/5

=27×1/49/20

=27×204×9

=3×5

=15 bar

Hence, the correct answer is option: 'B'.

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