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JEE Main 202325 JanuaryEvening Shift
Exam
JEE Main
Year
2023
Date
25 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

JEE Main 2023 · 25 January · Evening Shift · Chemistry · Some Basic Concepts of Chemistry

Number of hydrogen atoms per molecule of a hydrocarbon A having 85...

Number of hydrogen atoms per molecule of a hydrocarbon A having 85.885 . 8 % carbon is (Given : Molar mass of A=84gmol−1A = 84g{mol}^{- 1} )

Correct answer

0

Step-by-step solution

Using table of empirical formula for the compound:
Element Percentage Mole ratio
C 85.885 . 8 85.812=7.15\dfrac{85 . 8}{12} = 7 . 15 11
H 14.214 . 2 14.21=14.2\dfrac{14 . 2}{1} = 14 . 2 22

Thus, empirical formula is \left({CH}_{2}\right),empiricalmolecularmass=14<br/>Thus,, empirical molecular mass = 14<br />Thus,\dfrac{MolecularMass}{EmpiricalMass} = n</p><p></p><p>14 \times n = 84</p><p></p><p>n = 6</p><p></p><p>∴MolecularformulaMolecular formula{C}_{6}{H}_{12}

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