Question

Calculate the molarity of a solution prepared by dissolving 175 g of KNO3 in 750 mL of water. Round to the nearest hundredth. Don't forget the units.

Answer 1

Molar mass KNO₃ = 101.1032 g/mol

Mass of solute = 175 g

Volume = 750 ML in liters : 750 / 1000 = 0.75 L

Number of moles:

n = mass of solute / molar mass

n = 175 / 101.1032

n = 1.7309 moles

Molarity :

M = moles of solute / volume in liters

M = 1.7309 / 0.75

= 2.307 M

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