calculations involving colligative properties l.
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CALCULATIONS INVOLVING COLLIGATIVE PROPERTIES. Section 18.4. AFTER READING SECTION 18.4, YOU SHOULD KNOW:. How to calculate molality (m) How to calculate the molar mass of a molecular compound from the freezing point depression or boiling point elevation. MOLALITY .

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after reading section 18 4 you should know
AFTER READING SECTION 18.4, YOU SHOULD KNOW:
  • How to calculate molality (m)
  • How to calculate the molar mass of a molecular compound from the freezing point depression or boiling point elevation
molality
MOLALITY
  • Molality (m) – the number of moles of solvent dissolved per kilogram of solvent
  • m = mol solute / kg solvent
  • Mole fraction

nA = moles of solute A nB moles of solvent B

    • XA = nA XB = nB

nA + nB nA + nB

boiling point elevation
BOILING POINT ELEVATION
  • Change in boiling point temperature
  • ΔTb = Kb * m
    • ΔTb = change in boiling pt temp
    • Kb = molal boiling-point elevation constant
      • Depends on the solvent
      • Units (oC / m)
    • m = molality (mole / kg)
freezing point depression
FREEZING POINT DEPRESSION
  • Change in freezing point temperature
  • ΔTf = Kf * m
    • ΔTf = change in freezing pt temp
    • Kf = molal freezing-point depression constant
      • Depends on the solvent
      • Units (oC / m)
    • m = molality (mole / kg)
slide6

AFTER READING SECTION 18.4, YOU SHOULD KNOW:

  • How to calculate molality (m)
  • How to calculate the molar mass of a molecular compound from the freezing point depression or boiling point elevation