What is the molarity of a solution made by mixing 3.50 g of potassium chromate (K2CrO4), in enough water to make 100 mL of solution?

Answer 1

Molarity (M) is defined as moles of solute per liter of solution

moles of solute (K₂CrO₄) = 3.50 g K₂CrO₄ x 1 mol K₂CrO₄/194.2 g = 0.0180 moles

liters of solution = 100 ml x 1 L/1000 ml = 0.100 L

Molarity (M) = 0.0180 moles/0.100 L = 0.180 M