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When ethane reacts with oxygen to form carbon dioxide and water. When 10 molecules of ethane react with 20 molecules of oxygen, what is the composition of the FINAL mixture?

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    I would balance the equation:

    C2H4+3O2 >> 2CO2 + 2H2O

    So it looks to me as if you did not have enough oxygen, which means, only 2/3 of the ethane was consumed.

    So you have an issue, as molecules only occur in whole number.

    I see
    4 molecules C2H4 ; six consumed
    2 molecules O2 left; 18 consumed
    CO2; six made
    H2O; twelve made

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