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3 July, 12:20

Water is a produced when 30.0 grams of hydrogen reacts with 80.0 grams of oxygen what is the limiting reagent

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  1. 3 July, 13:04
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    The balanced equation for the reaction is as follows

    2H₂ + O₂ - - > 2H₂O

    stoichiometry of H₂ to O₂ is 2:1

    number of H₂ moles - 30.0 g / 2 g/mol = 15 mol

    number of O₂ moles - 80.0 g / 32 g/mol = 2.5 mol

    limiting reactant is the reagent in which only a fraction is used up in the reaction

    if H₂ is the limiting reactant

    if 2 mol of H₂ requires 1 mol of O₂

    then 15 mol of H₂ requires 1/2 x 15.0 = 7.5 mol of O₂

    but only 2.5 mol of O₂ is required

    this means that O₂ is the limiting reagentt and H₂ is in excess
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