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JEE MainChemistrySome Basic Concepts of Chemistry

An organic compound contains carbon, hydrogen, and oxygen. The mass ratio of these elements in the compound is 6 : 1 : 8 respectively. If the vapor density of the compound is 45 , its molecular formula is :

Options

  1. ACH ₂ O
  2. BC ₂ H ₄ O ₂
  3. CC ₆ H ₁₂ O ₆
  4. DC ₃ H ₆ O ₃

Correct answer

D. C ₃ H ₆ O ₃

Step-by-step solution

The mass ratio of C : H : O is given as 6 : 1 : 8 . To find the mole ratio, divide the mass of each element by its respective atomic mass: Moles of C = 6 12 = 0.5 Moles of H = 1 1 = 1 Moles of O = 8 16 = 0.5 The simplest whole-number ratio of moles is: C : H : O = 0.5 : 1 : 0.5 = 1 : 2 : 1 Thus, the empirical formula of the compound is CH ₂ O . Empirical formula mass = 12 + 2(1) + 16 = 30 The molar mass of the compound is related to its vapor density by: Molar mass = 2 Vapor density = 2 45 = 90 g/mol The integer mu

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