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14 June, 17:56

What is the mass, in g, of one molecule of ethane, C2H6?

A. 3.0 x 10-23

B. 5.0 x 10-23

C. 30

D. 1.8 x 1025

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Answers (1)
  1. 14 June, 18:23
    0
    B. 5.0 x 10^ (-23)

    Explanation:

    m = n * MM

    where

    m is mass

    n is moles

    MM is molecular mass

    One molecule of a substance is 1 / 6.022 * 10^23 moles

    The molecular mass of C2H6 is the sum of the atomic masses of each of the atoms present in the molecule. 2 carbon atoms + 6 hydrogen atoms. This gives

    30.07.

    So m = (1 / (6.022*10^23)) * 30.07 = 5.0 * 10^ (-23)
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