# Chemestry

What is the van't Hoff factor for K2SO4 in an aqueous solution that is 5.00 % K2SO4 by mass and freezes at -1.21 ∘C?

1. 👍 0
2. 👎 0
3. 👁 886
1. 3.

1. 👍 0
2. 👎 0
2. You don't believe 3? That's the right answer.

1. 👍 0
2. 👎 0
3. My Home work is online. When I gave that answer it said 3 is wrong.

1. 👍 0
2. 👎 0
posted by Raquel
4. This is college chem 132

1. 👍 0
2. 👎 0
posted by Raquel
5. The theoretical number is 3 for K2SO4. Since all of that other information is included you must want the actual factor for this particular solution.
5% K2SO4 = 5g K2SO4/100 g solution which is 5g K2SO4/95 g solvent.
mol K2SO4 = 5/molar mass K2SO4
m K2SO4 = mols K2SO4/0.095 kg solvent. Plug in and solve for m K2SO4.
Then dT = i*Kf*m
1.21 = i*1.86*m
Solve for i. It should be close to 3 but not exactly 3.

1. 👍 0
2. 👎 0
6. 2.15

1. 👍 0
2. 👎 0
posted by ahisma
7. bhag yaha se

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry

for a question it is given that there is 14.6 g of calcium chloride in 246 g of water. Kf is 1.86 C/m we need to find the freezing point of this solution. when i do the calculations, i get the freezing point to be -0.99 (without

asked by Ania on November 8, 2012
2. ### chemistry

A 0.100 m K2SO4 solution has a freezing point of -0.43°C. What is the van't Hoff factor for this solution? Kf = 1.86°C/m

asked by Anonymous on February 5, 2012
3. ### chemistry

What is the expected van't Hoff factor for NaC2H3O2 in an aqueous solution, assuming 100% dissociation.

asked by kyle on December 6, 2010
4. ### Chemistry

If an 0.650 m aqueous solution freezes at –2.00 °C, what is the van't Hoff factor, i, of the solute? Kf values can be found here. the Kf value is 1.86 °C/m. I get 2 for the answer but it is wrong. Please help!

asked by Anonymous on March 1, 2013
5. ### chem 2

The boiling point of an aqueous 1.83 m salt solution is 102.5°C. Determine the value of the van't Hoff factor for this solute if the Kb for water is 0.512°C/m.

asked by gigi on October 6, 2012
6. ### AP Chemistry

What is the Van't Hoff Factor of MgSO4*7H2O? We're doing a colligative properties lab at my school where we dissolve various amounts of MgSO4 in 100 grams of water. What value/range of values should I expect the Van't Hoff Factor

asked by David on December 6, 2014
7. ### Chemistry

A 1.00% by mass MgSO4(aq) solution has a freezing point of -0.192°C. Water has a kf of 1.86 (K·kg)/mol. (a) Estimate the van't Hoff i factor from the data. (b) Determine the total molality of all solute species. I can probably

asked by Trixie on February 15, 2010
8. ### Chemistry - Van't Hoff Factor

How does the van't hoff factor relate to freezing points? If one van't hoff factor is bigger than another, is its freezing point lower or greater? delta Tf = iKfm. So increasing i will increase delta Tf Van't Hoff factor is the

asked by Belinda on January 5, 2007
9. ### CHEMISTRY- vant hoff

a 0.100m k2so4 solution has a freezing point of -0.43 degrees. what is the van hoff factors for this solution? kf=1.86degree/m? 0.77 3.0 1.0 2.3 i have used the equation dT=iKfm and get -2.3?

asked by lulu on October 14, 2010
10. ### Chemistry

At 100 degrees C, pure H2O has a vapor pressure of 760 torr. An aqueous solution has a concentration of 1.90 M MgCl2. The van't Hoff factor is 2.45. The density of the solution is 1.09 g/mL. Calculate the vapor pressure of the

asked by Ayaka on May 24, 2016

More Similar Questions