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19 December, 09:04

You have 16.7 grams of hydrogen and 15.4 grams of oxygen in a synthesis rxn. Which is the limiting reagent?

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  1. 19 December, 09:27
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    oxygen is limiting reactant

    Explanation:

    Given dа ta:

    Mass of hydrogen = 16.7 g

    Mass of oxygen = 15.4 g

    Limiting reactant = ?

    Solution:

    Chemical equation:

    2H₂ + O₂ → 2H₂O

    Number of moles of hydrogen:

    Number of moles = mass / molar mass

    Number of moles = 16.7 g / 2 g/mol

    Number of moles = 8.35 mol

    Number of moles of oxygen:

    Number of moles = mass / molar mass

    Number of moles = 15.4 g / 32 g/mol

    Number of moles = 0.48 mol

    Now we will compare the moles of both reactant with product,

    H₂ : H₂O

    2 : 2

    8.35 : 8.35

    O₂ : H₂O

    1 : 2

    0.48 : 2*0.48 = 0.96 mol

    The number of moles of water produced by oxygen are less so it will limiting reactant.
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