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A gaseous hydrocarbon on combustion gives 0 . 72 g of water and 3 . 08 g CO 2 . What is the empirical formula of the hydrocarbon?

Options

  1. AC 6 H 5
  2. BC 7 H 8
  3. CC 2 H 4
  4. DC 3 H 4

Correct answer

B. C 7 H 8

Step-by-step solution

C x H y + x + y 4 O 2 ⟶ xC O 2 + y 2 H 2 O Moles of CO 2 = 3 . 0 8 4 4 = 0 . 0 7  moles = x Moles of H 2 O = 0 . 7 2 1 8 = 0 . 0 4  moles = y 2 x   =   0 . 07   g atoms of carbon y   =   0 . 08   g atoms of hydrogen       x               :                 y 0 . 07                 0 . 08       7         &#16

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