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The molecular mass of an organic compoun...

The molecular mass of an organic compound is 78 and its percentage composition is 92.4% C and 7.6% H. Determine the molecular formula of the compound.

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To determine the molecular formula of the compound with a molecular mass of 78 and a percentage composition of 92.4% carbon (C) and 7.6% hydrogen (H), we can follow these steps: ### Step 1: Assume a Sample Size Assume a sample size of 100 grams of the compound. This makes the calculations straightforward since the percentages can be directly converted to grams. ### Step 2: Calculate the Mass of Each Element - **Mass of Carbon (C)**: Since the percentage of carbon is 92.4%, the mass of carbon in 100 grams of the compound is: \[ ...
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Knowledge Check

  • The percentage composition of a compound C=90% and H=10% . A possible formula of the compounds is

    A
    `C_(8)H_(10)`
    B
    `C_(15)H_(30)`
    C
    `C_(15)H_(20)`
    D
    `C_(15)H_(15)`

  • An organic compound contains 49.3% carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of the compound is

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    `C_(3)H_(5)O_(2)`
    B
    `C_(4)H_(10)O_(2)`
    C
    `C_(6)H_(10)O_(4)`
    D
    `C_(3)H_(10)O_(2)`

  • An organic compound contains 49.3% carbon 6.84% hydrogen and its vapour density is 73 . Molecular formula of the compund is

    A
    `C_(3)H_(5)O_(2)`
    B
    `C_(6)H_(10)O_(4)`
    C
    `C_(3)H_(10)O_(2)`
    D
    `C_(4)H_(10)O_(2)`

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