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4 March, 23:12

A sample of a compound contains 32.0 g C and 8.0 g H. Its molar mass is 30.0 g/mol. What is the compound's molecular formula

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  1. 4 March, 23:32
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    The compound's molecular formula is C2H6. This is obtained by:

    mass moles divided by smallest moles

    C 32g 32/12 = 2.67 1

    H 8g 8/1.01 = 7.92 approx. 3

    Next, divide both terms by the smallest number of moles, 2.67. This gives 1 and 3. So the empirical formula is CH3 which has a molar mass of 15g/mol. Given the molar mass of the molecular formula as 30g/mole, we can calculate the factor by which to multiply the subscripts of CH3.

    X = molar mass of molecular formula / molar mass of empirical formula = 30/15

    X=2

    So (CH3) 2 is C2H6.
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