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March 29, 2017

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What is the boiling point of the solution in which you are going to cook spaghetti if it contains 51.0 g of NaCl dissolved in 1.30 L of water? Assume the density of water is 1.00 g/mL. Use molar masses with at least as many significant figures as the data given. Enter your answer with two decimal places.

  • chemistry - ,

    moles NaCl = grams/molar mass
    Solve for moles NaCl.

    molality = moles NaCl/kg solvent
    Solve for molality (kg solvent = 1.30).

    delta T = i*Kb*molality
    You have i = 2, Kb, and molality. Solve for delta T, then add that to 100 C to find the boiling point.

  • chemistry - ,

    what's Kb?

  • chemistry - ,

    Isn't that 0.512 degrees C/m? I think so.

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