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A 1.8 mole sample of a compound weighs 195 g and is found to be 11.18% H and 88.82% C. What is
the molecular formula for the compound?

  • Chemistry -

    Take a 100 g sample which will give you
    11.18 g H and 88.82 g C.
    mols C = 88.81/12 = ?
    mols H = 11.18/1 = ?
    Now find the ratio of the two elements to each other. I obtained C2H3.
    empirical mass = 27
    mols = grams/molar mass
    You have moles and grams, solve for molar mass.

    Then molar mass = empirical mass*y
    Substitute and solve for y and from that the molecular formula.

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