Organic chemistry

A 200.0g sample of glucose(180.16g/mol, Kmp=1.86 degrees celcius/m, mp=146 degrees celcius)is contaminated with 5.000g of table salt, sodium chloride(58.44g/mol, mp=801 degrees celcius). What would the expected melting point of the mixture be?

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  1. I assume NaCl does not ionize when dissolved in glucose.
    mols NaCl = grams/molar mass.
    Subsittute and solv for mols NaCl.

    Then m = molality NaCl = mols/kg solvent
    Substitute mols from above and kg solvent is 0.200 kg, and solve for m.

    Then delta T = Kf*m
    You have Kf for glucose in the problem and you've solved for m, calculate delta T.
    Finally, subtract delta T from the normal melting point of glucose.

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    posted by DrBob222
  2. Thanks, DrBob222

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  3. is the answer 141.67 pleaase help?

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    posted by meg

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