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3 April, 03:51

How many grams of NaOH were dissolved to make a 1.25 L solution of 2.92 M NaOH?

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Answers (1)
  1. 3 April, 04:08
    0
    146. g

    Explanation:

    1) dа ta:

    a) mass of solute = ?

    b) volume of solution = 1.25 liter

    c) M = 2.92 mol/liter

    d) solute NaOH

    2) Formulae:

    a) Molarity, M = number of moles of solute / volume of solution in liters

    b) mass in grams = molar mass * number of moles

    3) Solution:

    a) Calculate number of moles of solute:

    M = number of moles of solute / volume of solution in liters

    ⇒ number of moles of solute = M * volume of solution in liters

    ⇒ number of moles of solute = 2.92 mol/liter * 1.25 liter = 3.65 mol

    b) Molar mass of NaOH = 39.997 g/mol (you can take this number from internet or calculate it using the atomic masses of Na, O, and H).

    c) Calculate the mass of solute:

    mass in grams = molar mass * number of moles = 39.997 g/mol * 3.65 mol = 145.98905 g = 146. g

    The answer must be reported with 3 significant figures, so it is 146. g.
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