What is the molarity of a solution containing 55.8 g of mgcl2 dissolved in 1.00 l of solution?

The answer is 0.59 M.

Molar mass (Mr) of MgCl₂ is the sum of the molar masses of its elements.

So, from the periodic table:

Mr (Mg) = 24.3 g/l

Mr (Cl) = 35.45 g/l

Mr (MgCl₂) = Mr (Mg) + 2Mr (Cl) = 24.3 + 2 · 35.45 = 24.3 + 70.9 = 95.2 g/l

So, 1 mol has 95.2 g/l.

Our solution contains 55.8g in 1 l of solution, which is 55.8 g/l

Now, we need to make a proportion:

1 mole has 95.2 g/l, how much moles will have 55.8 g/l:

1 M : 95.2 g/l = x : 55.8 g/l

x = 1 M · 55.8 g/l : 95.2 g/l ≈ 0.59 M