Asked by Anonymous

Substance X raises the boiling point of 150g of water to 101.3 C. What is the molecular mass of substance X? (assume x does not ionize/ is not volatile)
Answered by DrBob222
delta T = K <sub>b</sub>*molality.
molality = mols/kg solvent
Answered by Anonymous
what is the value for Kb? .52?
Answered by DrBob222
Yes, K<sub>b</sub> is 0.52 for water.
By the way, the K<sub>f</sub> for water is 1.86 degrees c/m. I think I may have given you 0.52 for the freezing point constant in an earlier problem.
Answered by Anonymous
Yes, I just wanted to verify it was the same thanks
Answered by DrBob222
It isn't the same. Kf for water is 1.86.
Kb for water is 0.52
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