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    A compound with $M_r = 102$ contains 58.8 % carbon, 9.80 % hydrogen and 31 % oxygen by mass.

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    HLPaper 1A

    A compound with Mr=102M_r = 102Mr​=102 contains 58.8 % carbon, 9.80 % hydrogen and 31 % oxygen by mass.
    What is its molecular formula?

    ArA_rAr​: C = 12.0; H = 1.0; O = 16.0

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