What is the molarity of the following solutions?

Question

(a)4.3 mol KCl in 1.0 L of solution

 

(b) 1.92 mol H₂SO₄ in 348 mL of solution

 

(c) 0.891 mol of ammonia in 225 mL of solution

 

Answer 1

Molarity = moles of solute per liter of solution. (learn this definition)!

(a). moles of solute = 4.3 mols

liters of solution = 1.0 L

Molarity (M) = 4.3 mols / 1.0 L = 4.3 M

(b). moles of solute = 1.92 mols

liters of solution = 348 mls x 1 L / 1000 mls = 0.348 L

Molarity (M) = 1.92 mols / 0.348 L = 5.52 M

(c). moles of solute = 0.891 mols

liters of solution = 225 mls x 1 L / 1000 ml = 0.225 L

Molarity (M) = 0.891 mols / 0.225 L = 3.96 M