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24 June, 21:32

If a car produces 62g of CO2, how many grams of O2 are used up in the reaction?

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  1. 25 June, 00:23
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    Given:

    Amount of CO2 produced = 62 g

    To determine:

    Amount of O2 consumed

    Explanation:

    If ethanol (C2H5OH) is the fuel used during combustion then the reaction is:

    C2H5OH + 3O2 → 2CO2 + 3H2O

    Based on the reaction stoichiometry:

    3 moles of O2 will produce 2 moles of CO2

    # moles of CO2 produced = 62 g / 44 g. mol-1 = 1.4091 moles

    Therefore,

    # moles of O2 consumed = 1.4091 * 3/2 = 2.1137 moles

    Mass of O2 used up = 2.1137 moles * 32 g/mole = 67.64 g

    Ans: The mass of O2 used up during combustion of ethanol would be around 68 g
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