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?

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