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Chem

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An aqueous KNO3 solution is made using 82.7 grams of KNO3, diluted to a total solution volume of 1.50 L. The density of this solution is 1.05 g/mL. What is the molality of this solution?

  • Chem -

    moles KNO3 = grams/molar mass
    Solve for moles.

    mass soln = volume x density = ??

    mass H2O = total mass soln - mass solute.

    molality = moles/kg solvent

  • Chem -

    so correct me if i may be wrong...

    82.7gKNO3x1mol/101.11gKNO3=0.8179mol

    1.5Lx1000ml/1Lx1.05g/1mL=1575g

    1575-82.7=1492.3g

    0.8179mol/1.4923kg=0.54808molal?

  • Chem -

    I agree but you have too many significant figures. You're allowed only 3.

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