# Chemistry

I have this awful problem due tomorrow; if anyone can help it would be much appreciated.

Most introductory chemistry texts provide a formula for the freezing point depression/boiling point of elevations:

delta-T(f,b)= K(f,b) * m
(m = molality)

In fact, these are derived equations for dilute solutions. They are generated from the more general relationships....
ln Xsolv= delta-b/R [(1/T) - (1/Tb)]
-ln Xsolv= delta-Hf/R [(1/T) - (1/Tf)]

Please derive the latter from the former for boiling point elevation, and indicate which values are contained in the super-constant Kb. (This is a difficult derivation; you'll find some assumptions are made based on the fact that the solution is dilute.)

Two question first on just what's being asked:
1. I'm going to start with the first equation and end up with one of the next two, correct?
2. What does it mean "Indicate which values are contained in the super-constant Kb"?

Here are my thoughts so far, looking just at the variables in both equations:
I know that...
ln P2/P1= delta-Hfusion/R [(1/T2)-(1/T1)]
dT/dP= delta-Hfusion/T [V1 - V2]
Μu(i)= Μu°i + RT ln a(i)
And in dilute systems a(i) --> 1
P(i)= Xi*P°i
P(t)= XB(P°B - P°A) + P°A

I looked through my worksheets and tried to pull out anything that looked useful, but I'm not sure how to piece it all together. Any help would be much appreciated.

1. 👍
2. 👎
3. 👁

## Similar Questions

1. ### English

If it snows tomorrow, what will you do? 1. If it snows tomorrow, I will go out with my dog. 2. If it snows tomorrow, I will make a snow man at the back yard. 3. If it snows tomorrow, I will meet my girl friend. 4. If it snows

2. ### English

Choose the option that corrects the error in the underlined portion. If no error exists, choose "No change is necessary." Ted told James that they had been given too much work by their boss and the deadline was tomorrow, which

3. ### math

The probability that James will win two races in the next two days is 1/8 for tomorrow and 1/10 for the day after tomorrow. What is P(win tomorrow, then win the day after tomorrow)?

4. ### Math Riddle

What day would yesterday be if Wednesday was five days before the day after tomorrow? pLEASE HELP ME WITH THE RIDDLE i POSTED!!!!!! EARLIER waht materials could upumuse Alright already! I really wondered why you just didn't pick

1. ### Language Arts

Which of the following sentences about the selection uses the past perfect tense? A. I have planned to see the movie tomorrow B. I still plan on going to see the movie tomorrow C. I had planned to see the movie tomorrow, until I

2. ### Physics

You are on an airplane traveling 30° south of due west at 130 m/s with respect to the air. The air is moving with a speed 30 m/s with respect to the ground due north. One question.. 2) What is the heading of the plane with

3. ### Pre-Calculus

What are the vertices and co vertices of the ellipse x^2/4 + y^2/25=1 I actually have no idea how to even start to solve this problem, so any help will be appreciated. Steps on how this problem is solved are also appreciated.

4. ### Math

What is 16 = w/-2 HELP ME its due tomorrow!

How do you do a word cited page? please help me so confused. Paper due tomorrow. Thank you

2. ### AP chem

I have a problem set due tomorrow, and two problems in it were not covered in class. The first is this: Molybdenum has an atomic radius of 0.145 nm. The volume of its cubic unit cell is 0.0375 nm^3. What is the geometry of the

3. ### Art

Hello. I'm suppose to examine the "winged genie fertilizing a date tree" and explain the elements of art found in the work, one particular element that helped with the overall success of the artwork, and explain what type of

4. ### English

I have a paper due tomorrow and I need to include my personal interview, how would I do this in APA format? Any help would be greatly appreciated.