# chemistry

a student needs to prepare an aqueous solution of sucrose at a temperature of 20 degrees c with a vapor pressure of 15. 0 mm Hg. How many grams of sucrose (mm=342 g/mol) does she need if she uses 375 g H20? (the vapor pressure of water at 20 degrees c is 17.5 mm Hg)

1. 👍
2. 👎
3. 👁
1. Psoln = XH2O*PoH2O
15.0 torr = XH2O*17.5 torr
Solve for XH2O which gives you the mole fraction that H2O must be. I'll call that ??

[molesH2O/(moles H2O + moles sucrose)]=??

moles H2O = grams water/molar mass H2O, substitute this into the equation immediately above this (both numerator and denominator) and solve for moles sucrose.

Finally, moles sucrose = grams/molar mass sucrose.

Then check everything to make sure all of that gives you 15.0 torr.

1. 👍
2. 👎
2. 228.5

1. 👍
2. 👎

## Similar Questions

1. ### chemistry

find the mass of sucrose(molecular mass=342)required to be dissolved per 600cm3 solution to prepare a semi molar solution

2. ### Chemistry

Find the mass of sucrose molecular Mass 342 required to be dissolved in 600 cm ³ solution to prepare a semi molar solution

3. ### science-biology

In lab, you use a special balloon that is permeable to water but not sucrose to make an "artificial cell". The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40%

4. ### Chemistry

At 25 degrees Celsius all of these are true for a neutral solution : pH = 7.00, pOH = 7.00, and [H+] = [OH-] is that correct? For a neutral, aqueous solution regardless of temperature.. would the only correct statement be [H+] =

1. ### chem help asap

starting with solid sucrose describe how you would prepare 125ml of. 150 M sucrose solution

2. ### Chem

How much water must be added to 500.mL of .200M HCL to produce a .150M solution? (.500mL x .200M)/.150M = .667mL Correct? A chemistry student needs 125mL f .150M NaOH solution for her experiment, but the only solution avail. is

3. ### chemistry

The heat of solution of potassium acetate (KC2H3O2) in water is -15.3 kJ/mol. If 18.8 g of KC2H3O2(s) is dissolved in 655 mL of water that is initially at 25.8 °C, what will be the final temperature (in degrees Celcius) of the

4. ### chemistry

Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 % sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed

1. ### chemistry

Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed

2. ### chemistry

The molar mass of sucrose, or table sugar, is 342 grams. Calculate how many grams of sucrose are required to make 3.0 liters of 0.50M sucrose solution.

3. ### BIO/CHIM

How many grams of sucrose would you need to prepare 10 mL of .01M solution of sucrose(FW+342g/mole)? show your work

4. ### Chemistry

A sample of sucrose(table sugar) with a mass of 1.32g is burned in a 1L bomb calori meter. The temperature changed from 25degree celcius to 27.31 degree celcius. Calculate the heat of combustion of sucrose in units of KJ/mol. The