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March 25, 2017

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Urea (NH2)2CO is dissolved in 100.0 g of water. The solution freezes at -0.085 degrees C. how many grams of urea were dissolved to make this solution.

delta T = Kf*molality
Plug in 0.085 for delta T, I assume you know Kf for water, calculate molality.
Then molality x kg solvent x molar mass = grams.
You have all but molar mass which can be calculated.

0.085 degrees C = 0 degrees C (0.1 kg/60 g of (NH2)2CO

is this right

  • Chemistry - ,

    See above.
    You don't need to post multiple times. It takes a LITTLE time to read, solve, and compose and answer for you.

  • Chemistry - ,

    well actually i double clicked the submit button and it posted it twice... sorry

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