Homework Help: Chemistry

Posted by Timothy on Wednesday, September 8, 2010 at 3:02pm.

Which of the following statements about boiling points are false:
A. the boiling point of 0.1 m KF(aq) is lower than the boiling point of 0.1 m ethanol(aq)
B. the boiling point of a 0.5 m aqueous solution of NaOH is the same as the boiling point of a 0.5 m aqueous solution of NaCL
C. the boiling point of 1 m aqueous NaNO3 is lower than the boiling point of 1 m aqueous Ca(N03)2
D. the boiling point of a solution made by dissolving 20 g of C2H6O2 in 0.50 kg of water is lower than the boiling point of a solution of 20 g of NaCL in 0.50 kg of water
E. the boiling point of 2 m Nal in water is 101 degrees celcius

Chemistry - DrBob222, Wednesday, September 8, 2010 at 4:52pm
You can use delta T = i*kb*m for each of these. For example, for A.
i = 2
Kb = 0.51
m = 0.1 all for KI.

for ethanol,
i = 1
Kb = 0.51
m = 0.1

therefore, A is false.

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