7 general chemistry questions.
Example: At 20 degrees Celcius, the vapor pressure of toluene is 22 mm Hg and that of benzene is 75 mm Hg. An ideal solution, equimolar in toluene and benzene, is prepared. At 20 degrees Celcius, what is the mole fraction of benzene in the vapour in equlibrium with this solution?
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35. (B) Because H2SO4 is a strong acid, almost all of it dissociates completely to give
H3O+ and SO42- ions. For every sulphate ion, two hydronium ions are formed.
36. (D) Mole fraction of benzene = 75/(75+22) = 0.77
37. (A) Because Potassium Sulphate is a highly ionic salt, its dissolution in water will raise the boiling point much more that the others.
The expert examines molarity, molar mass, oxidizing agents and mole fractions. The vapour in equilibriums are determined.