# chem

Liquids A and B form an ideal solution. A certain solution contains 25 mole % of A, whereas the vapor in equilibrium with the solution at 25 degrees C contains 50. mole % of A. The heat of vaporization of A is 5 kcal/mol; that of B is 7 kcal/mol.
a) Calculate the ratio of the vapor pressure of pure A to that of pure B at 25 degrees C.
b) Calc. value for the same ratio at 100.degrees C.

P1(a)=X1(a)P1*(a)
P2(a)=X2(a)P2*(a)
P1(b)=X1(b)P1*(b)
P2(b)=X2(b)P2*(b)

where P1(a)=P2(a)=P1(b)=P2(b)
but if I did
.50P2*a=.25P1*a,
P1/2*a would = 0, as would P2/1*b if I did the same for b.

So how do I really approach this?

1. 👍 0
2. 👎 0
3. 👁 253
1. no clue

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry

1. If an aqueous solution that is 0.15 M in HF has an osmotic pressure of 3.9 atm at 25oC, what is the percent ionization of HF at this concentration? 2. A mixture of 2 volatile liquids is said to be ideal if each component obeys

asked by Michelle on February 4, 2015
2. ### Chemistry

Two liquids A and B have vapor pressures of 71.3 and 131 mmHg, respectively, at 25 degrees Celsius. What is the total vapor pressure of the ideal solution made up in the following concentrations? 1.00 mole of A and 1.00 mole of B

asked by Vivian on December 7, 2012
3. ### Chemistry

The general statement: "like dissolves like" means: identical compounds will dissolve to form a solution. one stronger component must beak down the weaker component. liquids will only dissolve in liquids. solid will dissolve in

asked by Melissa on July 18, 2008
4. ### chemistry 1B

1-propanol (P1° = 20.9 Torr at 25 °C) and 2-propanol (P2° = 45.2 Torr at 25 °C) form ideal solutions in all proportions. Let x1 and x2 represent the mole fractions of 1-propanol and 2-propanol in a liquid mixture,

asked by Anonymous on February 26, 2013
5. ### Chemistry

8 g of sulphur is burnt to form SO2 which is oxidized by Cl2 water The solution is treated with BaCl2 solution The amount of BaSO4 precipitated is A/ I mole B/ 0.5 mole C/ 0.24 mole D/. 0.25 mole Which option is correct??

asked by Viraj on June 24, 2014
6. ### Chemistry

An example of a solution that exhibits a positive deviation from Raoult’s Law (total pressure is greater than expected) is a solution of acetone (CH3COCH3) and carbon disulfide (CS2). a) Draw Lewis structures for these

asked by Laffy Taffy on March 11, 2012
7. ### CHEMISTRY

Which of the following solutions contain the greatest total ion concentration? a) one mole of potassium chloride dissolved in 1.0L of solution b)one mole of sodium phosphate dissolved in 1.0L of solution c)one mole of ammonium

asked by Jon on March 13, 2011
8. ### CHEMISTRY

Which of the following solutions contain the greatest total ion concentration? a) one mole of potassium chloride dissolved in 1.0L of solution b)one mole of sodium phosphate dissolved in 1.0L of solution c)one mole of ammonium

asked by Jon on March 13, 2011
9. ### physical chemistry

A solution is prepared by adding 1g of sugar mannitol (MW 182.2g/g-mole) in 100g of water at 20◦C. (a) Assuming that mannitol and water form an ideal solution, what is the equilibrium vapor pressure of solution? The vapor

asked by JP on December 3, 2014
10. ### Chemistry - University

Pentane (C5H12) and hexane (C6H14) form an ideal solution. The vapour pressure of pentane at 25oC is 511 mmHg and that for hexane is 150 mmHg. A solution is prepared by mixing pentane (density = 0.63 g/mL) and hexane (density =

asked by Gab on December 9, 2014

More Similar Questions