Question

10g of MgF2 are dissolved in 2.2L of water. What is the molarity of this solution?

Answer 1

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 :

`Molarity = (Number \ of \ moles )/(Volume\ in \ liter) \\\\Molarity = (0.161)/(2.2)\ M\\\\Molarity = 0.073 \ M`

Therefore, the molarity of solution is 0.073 M.