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29 November, 21:11

A 3.50 g sugar cube (sucrose: C12H22O11) is dissolved in a 350 mL teapot containing 80∘ C water (density of water at 80∘ C = 0.975 g/mL). What is the molality of the sugar solution?

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Answers (2)
  1. 29 November, 22:20
    0
    Answer: 0.04893mole/kg

    Explanation:

    Molality is defined as the mole of solute per kilogram of the solvent.

    Sugar is the solute while water is the solvent.

    Molar mass of sugar =

    1*12+1*22+11*16

    12+22+176=210g/mol.

    Mole of solute = reacting mass / molar mass

    Reacting mass 3.50g and molar mass 210g/mol

    Mole = 3.50/210=0.0167moles.

    For solvent

    Density=mass/volume

    Mass = density * volume

    0.975*350

    341.25g

    Converting gram back to kilogram

    341.25/1000 = 0.34125kg

    Molality = 0.0167/0.34125

    =0.04893mole/kg
  2. 29 November, 22:46
    0
    Molality is 0.03 m

    Explanation:

    Molality indicates the moles of solute that are contained in 1000g of solvent.

    We have solvent volume and density, so let's find out the mass:

    Solvent density = Solvent mass / Solvent volume

    Solvent density. Solvent volume = Solvent mass → 0.975 g/mL. 350 mL

    Solvent mass = 341.25g

    Now we need the moles of solute → mass of solute / molar mass

    3.50 g / 342 g/mol = 0.0102 moles

    So finally we can make a rule of three:

    341.25 g of solute contain 0.0102 moles of solute

    1000 g of solute, may contain (1000. 0.0102) / 341.25 = 0.03 m
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