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21 August, 11:33

A substance has an empirical formula of CH2 and a molar mass of 56 grams per mole. The molecular formula for this compound is

A

C4H8.

B

C4H6.

C

CH2.

D

C8H4.

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Answers (1)
  1. 21 August, 12:00
    0
    The molecular formula for this compound is C4H8 (option A)

    Explanation:

    Step 1: Data given

    Empirical formula of the compound is CH2

    Molar mass of the compound is 56 g/mol

    Step 2:

    Since the empirical formula is CH2, this means we have 1 mol C for each 2 mol H

    The molar mass of the empirical formula = 12 + 2*1 = 14 g/mol

    To find the molecular formula we have to multiply the empirical formula by n.

    n = molar mass of molecular formula / molar mass of empirical formula

    n = 56 / 14

    n = 4

    Molecular formula = 4 * (CH2) = C4H8

    We can check this by calculating the molar mass of this formula

    4*12 + 8*1 = 48+8 = 56 g/mol

    The molecular formula for this compound is C4H8 (option A)
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