NEET 2020 Chemistry Dalton's Law of Partial Pressures MCQ Question
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]
15 bar
18 bar
9 bar
12 bar
Correct Answer
Detailed Explanation
The number of moles of N₂ is 7/28 = 0.25 mol, and for Ar is 8/40 = 0.2 mol. The mole fraction of N₂ is 0.25/(0.25+0.2) = 0.556. The partial pressure of N₂ is 0.556 × 27 bar = 15 bar.
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