JEE Main · 2022 · 26 Jul 2022 · Shift 1 · States of Matter

A mixture of hydrogen and oxygen contains

40%

hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is ______ bar.
(Nearest Integer)

Answer: 2

Solution

Let mass of H₂ = 40 g, so moles of H₂ = 40/2 = 20 mol. Mass of O₂ = 60 g, so moles of O₂ = 60/32 = 1.875 mol. Total moles = 20 + 1.875 = 21.875 mol. Mole fraction of H₂ = 20/21.875. Partial pressure of H₂ = (20/21.875) × 2.2 = 2.01 bar ≈ 2 bar (nearest integer).

JEE Main · 2022 · 26 Jul 2022 · Shift 1 · Integer answer

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