Calculate the molarity of 0.50 mol MgCl2 in 750 ml of solution.

a) 0.38 M

b) 0.67 M

c) 0.75 M

d) 0.95 M

Option (b) 0.67 M

Explanation:

The following Data were obtained from the question:

Mole of MgCl2 = 0.5 mole

Volume of solution = 750mL

Molarity of MgCl2 =?

Next, we shall convert the volume given from mL to L. This is illustrated below:

1000mL = 1L

Therefore 750mL = 750/1000 = 0.75L

Now we can obtain the molarity of MgCl2 as follow:

Molarity is defined as the mole of solute per unit litre of the solution i.e

Molarity = mole /Volume

Molarity = 0.5/0.75

Molarity of MgCl2 = 0.67 M

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