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JEE Main202228 Jun 2022Evening ShiftChemistrySome Basic Concepts of ChemistryActual

Compound A contains 8 . 7 % Hydrogen, 74 % Carbon and 17 . 3 % Nitrogen. The molecular formula of the compound is, Given : Atomic masses of C , H and N are 12 , 1 and 14 amu respectively. The molar mass of the compound A is 162 g mol - 1 .

Options

  1. AC 4 H 6 N 2
  2. BC 2 H 3 N
  3. CC 5 H 7 N
  4. DC 10 H 14 N 2

Correct answer

D. C 10 H 14 N 2

Step-by-step solution

C 74 % 74 12 = 6 . 16 6 . 16 1 . 23 = 5 N 17 . 3 % 17 . 3 14 = 1 . 23 1 . 23 1 . 23 = 1 H 8 . 7 % 8 . 7 1 = 8 . 7 8 . 7 1 . 23 = 7 Emperical formula = C 5 NH 7 Emperical weight = 81 Multiplying factor = 162 81 = 2 Molecular formula= Empirical   formula n Molecular formula= C 5 NH 7 2 Molecular formula = C 10 N 2 H 14

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