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14 July, 05:03

A solution is made by dissolving

22.1 g of lithium fluoride (LiF) in

188 g of water.

What is the molality of the solution?

+1
Answers (1)
  1. 14 July, 08:23
    0
    4.52 mol/kg

    Explanation:

    Given dа ta:

    Mass of lithium fluoride = 22.1 g

    Mass of water = 188 g

    Molality = ?

    Solution:

    Molality:

    It is the number of moles of solute into kilogram of solvent.

    Formula:

    Molality = number of moles of solute / kilogram solvent

    Mathematical expression:

    m = n/kg

    Now we will convert the grams of LiF into moles.

    Number of moles = mass / molar mass

    Number of moles = 22.1 g / 26 g/mol

    Number of moles = 0.85 mol

    Now we will convert the g of water into kg.

    Mass of water = 188 g * 1kg/1000 g = 0.188 kg

    Now we will put the values in formula.

    m = 0.85 mol / 0.188 kg

    m = 4.52 mol/kg
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