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JEE Main202125 Feb 2021Morning ShiftChemistrySome Basic Concepts of ChemistryActual

Complete combustion of 1 . 80 g of an oxygen containing compound C x H y O z gave 2 . 64 g of CO 2 and 1 . 08 g of H 2 O . The percentage of oxygen in the organic compound is :

Options

  1. A53 . 33
  2. B50 . 33
  3. C51 . 63
  4. D63 . 53

Correct answer

A. 53 . 33

Step-by-step solution

n CO 2 = 2 . 64 44 = 0 . 06 n c = 0 . 06 weight of carbon = 0 . 06 × 12 = 0 . 72   gm n H 2 O = 1 . 08 18 = 0 . 06 n H = 0 . 06 × 2 = 0 . 12 weight of H = 0 . 12   gm =   1 . 8   -   ( 0 . 72   +   0 . 12 ) =   0 . 96   gram % weight of oxygen = 0 . 96 1 . 8 × 100 The percentage of oxygen in the organic compound =   53 . 3 % .

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