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28 July, 18:01

Ethane and acetylene are two gaseous hydrocarbons. chemical analyses show that one sample of ethane contains 2.65 g of carbon and 0.668 g of hydrogen, and one sample of acetylene contains 4.56 g of carbon and 0.382 g of hydrogen. write reasonable empirical formulas for these compounds.

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  1. 28 July, 19:32
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    Ethane

    C: 2.65 g

    H: 0.668 g

    1) Divide by the atomic mass of each element

    C: 2.65 g / 12.0 g/mol = 0.2208 mol

    H: 0.668 g / 1 g/mol = 0.668 mol

    2) Divide by the smallest number of moles:

    C: 0.2208 / 0.2208 = 1

    H: 0.668 / 0.2208 = 3

    => Empirical formula CH3

    Acetylene

    C: 4.56 g

    H: 0.382 g

    1) Divide by the atomic mass

    C: 4.56 g / 12.0 g/mol = 0.38 mol

    H: 0.382 g / 1 g/mol = 0.382 mol

    2) Divide by the smallest number

    C: 0.38 / 0.38 = 1

    H: 0.382 / 0.38 = 1

    => Empirical formula: CH
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