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1 January, 06:11

How many grams of solute are needed to make 125 mL of 2.50 M NH4Cl solution? Round to three significant digits.

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  1. 1 January, 06:17
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    Mass = 16.7 g

    Explanation:

    Given dа ta:

    Volume = 125 mL (125/1000 = 0.125 L)

    Molarity = 2.50 M

    Mass in grams of solute = ?

    Solution:

    First of all we will calculate the number of moles:

    Molarity = number of moles solute / volume in litter

    2.50 M = Number of moles of solute / 0.125 L

    Number of moles of solute = 2.50 M * 0.125 L

    Number of moles of solute = 0.313 mol

    Grams of solute:

    Number of moles = mass / molar mass

    Mass = number of moles * molar mass

    Mass = 0.313 mol * 53.5 g/mol

    Mass = 16.7 g
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