Question

What is the molarity of a solution made with 87g of Mgo dissolved in enough water to make

800mL of solution?

Answer 1

2.70 M.

Step-by-step explanation:

Molar mass of MgO = 24.3 + 16 = 40.3.

A molar solution will contain 40.3g in 1 Litre.

So 800 mL of 1 molar solution will contain 0.8* 40.3 g MgO.

So the molarity of the given solution

= 87 / (0.8*40.3)

= 2.699 M.