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Boiling Point Elevation and Freezing Point Depression
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Topic: Boiling Point Elevation and Freezing Point Depression (Read 1102 times)
IAmLegendToo
Full Member
Posts: 140
Boiling Point Elevation and Freezing Point Depression
«
on:
November 30, 2008, 07:58:52 PM »
Question 1:
Cyclohexane has a freezing point of 6.50C and a Kf of 20.0C/m. What is the freezing point of a solution made by dissolving 0.925 g of biphenyl (C12H10) in 25.0 g of cyclohexane?
Question 2:
Paradichlorobenzene, C6H4Cl2, is a component of mothballs. A solution of 2.00g in 22.5g of cyclohexane boils at 82.39C. The boiling point of pure cyclohexane is 80.70C. Calculate Kb for cyclohexane.
Not a clue where to start for either of these. Any help? Push in right direction? Something? lol
Thanks in advance for any help.
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IAmLegendToo
Full Member
Posts: 140
Re: Boiling Point Elevation and Freezing Point Depression
«
Reply #1 on:
December 01, 2008, 07:11:25 PM »
I'm thinking Part B's answer is:
Kb = 2.73 C/m
EDIT:
Tried it. Again, same as another problem. Rounding error, yet doesn't state SFs wanted. Crappy program. Hmm.
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IAmLegendToo
Full Member
Posts: 140
Re: Boiling Point Elevation and Freezing Point Depression
«
Reply #2 on:
December 01, 2008, 07:27:46 PM »
Solved.
Answer was 2.79 C/m.
Went ahead and did everything without ANY rounding. Came to 2.794 and several other numbers. So decided to pick 2.79. Was correct.
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cyclohexane has freezing point 50c
component mothballs solution 00g cyclohexane boils 39c boiling point pure cyclohexane 70c calculate cyclohexane
cyclohexane has freezing point what freezing point solution made dissolving 925 biphenyl
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component mothballs solution cyclohexane boils boiling point pure cyclohexane calculate cyclohexane
highschool chemistry paradichlorobenzene
component mothballs solution cyclohexane boils 39c
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