Asked by meghan
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)
Answers
Answered by
DrBob222
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.
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.
Answered by
Sebatian
228.5
Answered by
Jemal Hussein
Please send me the answer
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.