Given :
10g of MgF₂ are dissolved in 2.2L of water.
To Find :
The molarity of this solution.
Solution :
Molar mass of MgF₂ is :
M = 24 + 19 + 19 g/mol
M = 62 g/mol
Moles in 10 g of MgF₂, n = 10/62 = 0.161 moles.
Now, we know molarity is given by :
[tex]Molarity = \dfrac{Number \ of \ moles }{Volume\ in \ liter} \\\\Molarity = \dfrac{0.161}{2.2}\ M\\\\Molarity = 0.073 \ M[/tex]
Therefore, the molarity of solution is 0.073 M.
