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AP EAMCET2002ChemistrySome Basic Concepts of Chemistry

4 ~g of a hydrocarbon on complete combustion gave 12.571 ~g of CO ₂ and 5.143 ~g of water. What is the empirical formula of the hydrocarbon?

Options

  1. ACH
  2. BCH ₂
  3. CCH ₃
  4. DC ₂ H ₃

Correct answer

B. CH ₂

Step-by-step solution

Percentage of aligned C & = 12 14 weight of CO ₂ 100 weight of organic compound & = 12 44 12.571 4 100=85.7 % aligned Percentage of H aligned & = 2 18 weight of water 100 weight of organic compound & = 2 18 5.143 100 4 =14.3 % aligned array |c|c|c|c|c| array c S. No. array & % & array c Atomic wt. array & array c % atomic wt. array & array c Simple ratio array 1 & C 85.7 & 12 & 857 12 =7.15 & 715 7.15 =1 2 & H 14.3 & 1 & 14.3 1 =14.3 & 14.3 7.15 =2 array Empirical formula = CH ₂

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