Hexane (C6H14) and heptane (C7H16) are both volatile liquids that form ideal solutions over the full range or compositions when mixed together. Given the vapor pressures of pure hexane (121 mmHg) and heptane (40 mmHg) at 20°C, what is the vapor pressure of heptane over a hexane-heptane solution at 20°C when it contains mole fraction of hexane (Xhexane) equal to 0.75? A) 101 mmHg B) 91 mmHg C) 81 mmHg D) 30 mmHg E) 10 mmHg pure

3. The vapor pressure over a solution of urea (CH4N₂O) is 291.2 mm Hg (PA). The vapor pressure of pure water at the same temperature is 355.1 mm Hg (PºA). Calculate the mole fraction of urea in the solution. [See above for MM(urea)]

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Acetone (C3H6O) and ethyl acetate (C4H8O2) are frequently used as organic solvents. At 30°C, the vapor pressure of acetone is 285 mmHg and the vapor pressure of ethyl acetate is 118 mmHg. What is the vapor pressure at 30°C of a solution prepared by dissolving 25g of acetone in 22.5 g of ethyl acetate? Moles of acetone: Moles of ethyl acetate: Mole fraction of acetone: Mole fraction of ethyl acetate: Vapour pressure of vapour above solution mmHg

What would be the molar mass of a nonionic compound if 5.96 g of it is dissolved in 25.0 g of chloroform solvent to form a solution which has a boiling point elevation of 4.80∘C? Given that the boiling point constant of pure chloroform is 3.63∘C.

When 319. g of glycine (C₂H, NO₂) are dissolved in 1250. g of a certain mystery liquid X, the freezing point of the solution is 2.10 °C less than the freezing point of pure X. Calculate the mass of sodium chloride that must be dissolved in the same mass of .X to produce the same depression in freezing point. The van't Hoff factor i=1.70 for sodium chloride in X. Be sure your answer has a unit symbol, if necessary, and round your answer to 3 significant digits. 0 0.0 8 X 2

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A solution contains 4.50 moles of water, 1.10 moles of sucrose (C12H22O11), and 1.60 moles of glucose. Sucrose and glucose are nonvolatile. Assuming an ideal mixture, what is the vapor pressure of this solution at 35°C, given that the vapor pressure of pure water at 35°C is 42.2 torr?

What is the composition of a methanol –propanol  solution that has a vapor pressure of 85.7 torr at 40°C? At 40°C, the vapor pressures of pure methanol and pure propanol are 303 and 44.6 torr, respectively. Assume the solution is ideal. Mole fraction of methanol =  Mole fraction of propanol =

Pentane (C5H12) and hexane (C6H14) form ideal solution. At 25oC the vapor pressure of pentane and hexane are 511 torr and 150. torr, respectively. A solution is prepared by mixing 30.0mL pentane (density = 0.63g/mL) with 45.0mL hexane (density = 0.66 g/mL). (a) What are the mole fractions of pentane and hexane, respectively,in the solution? (b) What isthe total vapor pressure of the solution at 25oC? (c) What are the mole percent of pentane and hexane, respectively, in the vapor phase at 25oC? (Molar mass of pentane and hexane are: 72.15 g/mol and 86.17 g/mol, respectively.)