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Molality

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An aqueous solution contains 8.7% NaCl by mass.

1. Calculate the molality of the solution.
2. Calculate the mole fraction of the solution.

  • Molality -

    assume 100 grams of the solution.
    you have 8.7 g of NaCl, figure the moles
    You have 91.3 g of water, figure the moles

    calculate the mole fraction.

    molality=molesNaCl/kgsolvent

    and you have .1 kg solvent.

  • Molality -

    1.49 m

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