What is the mole fraction of methanol in this solution?

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 ∘C, the vapor pressure of pure benzene is 100.84 Torr. What is the vapor pressure of a solution made from dissolving 11.4 g of biphenyl in 33.4 g of benzene?

A solution is made by mixing 72.1 grams of propyl chloride, C3H7Cl, and 38.4 grams of propyl bromide, C3H7Br.  What is the vapor pressure of propyl chloride in teh solution at 25 degrees C?  Assume that the solution is an ideal solution.  The vapor pressure of pure propyl chloride is 347 torr at 25 deg C and of pure propyl bromide is 133 torr at 25 deg C.   - Thanks - need help!  I've worked this out for my quiz several times and cannot come up with the correct answer.  Heather (middle name).

A solution composed of 50.0 g strontium chloride (SrCl)) in 300 g of water at 12.0 °C. What is the mole fraction of SrCl2 in this solution? The molar mass of SrCl, is 158.5 g mol-1 and the molar mass of H2O is 18.02 g mol-1.

The normal boiling point of methanol is 64.7°C. A solution containing a nonvolatile solute dissolved in methanol has a vapor pressure of 670. torr at 64.7°C. What is the mole fraction of methanol in this solution? Mole fraction =

A student reacts benzene, C6H6, with bromine, Br2, to prepare bromobenzene, C6H5B1, and HBr. C6H6 + Br2 --> C6H5Br + HBr What is the theoretical yield of bromobenzene in this reaction when 34.8 g of benzene reacts with 57.8 g of bromine? grams Which chemical is the limiting reactant? Select an answer If the actual yield of bromobenzene was 38.5 g, what was the percent yield? Submit Question

A solution made up of a non-volatile solute in water at 60 °C has a pressure of 130.0 torr. The partial pressure of water is 149.4 torr at 60 °C. What is the mole fraction of the solute? Xsolute = [?] Remember: Psolution = Xsolvent · P solvent X, solute Enter

You have a solution which is 56.2% by mass isopropyl alcohol (molar mass = 60.11 g/ mol) in water. The density of this solution is 0.908 g/mL.   (a) What is the molality of the isopropyl alcohol in the solution? (b) What is the molarity of the isopropyl alcohol in the solution?  (c) What is the mole fraction of the isopropyl alcohol in the solution?

It says the answer should be 22.98 torr but I have no clue how to reach the answer. Any hints are great. Thanks!