JEE Main 2022ChemistryStates of MatterMediumNumerical

JEE Main 2022 — States of Matter Question with Solution

JEE Main 2022 (26 Jul Shift 2)

Question

A 10 g mixture of hydrogen and helium is contained in a vessel of capacity 0.0125 m3 at 6 bar and 27 °C. The mass of helium in the mixture is ..... g.

(Given : R=8.3JK-1 mol-1 (Atomic masses of H and He are 1u and 4u, respectively)

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Show full solutionCorrect answer: 8
Correct answer
8

Step-by-step explanation

PV=nmixRT

nmix=6×12.50.083×300≈3

Out of total 3 moles Let mole of He=x

Mole of H2=3-x

Then total mass of the mixture will be = 4x+23-x=10

Number of moles of He gas x=2 mol

Mass of He= number of moles × molar mass = 8 g

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About this question

This is a previous-year question from JEE Main 2022, covering the States of Matter chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.