Pentane (C5H12) and Hexane (C6H14) form an ideal solution. At 25degrees celcius the vapor preasure of pentane is 511 torr andhexane 150 torr. A solution is prepare by mixing 25 mL pentane(density .63 g/mL) with 45 mL hexane (density 0.66g/mL).

1. What is the vapor preassure of the resulting solution?

2. What is the composition by mole fraction of pentane in thevapor that is in equilibium with this solution?

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Collen VonLv2

13 Dec 2019

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1, A solution is prepared by mixing 25 mL pentane (C5H12, d = 0.63 g/cm3) with 47 mL hexane (C6H14, d = 0.66 g/cm3). Assuming that the volumes add on mixing, calculate the mass percent, mole fraction, molality, and molarity of the pentane. Mass percent = % Mole fraction = Molality = mol/kg Molarity = mol/L 2, A solution is made by dissolving 22.4 g urea (CH4N2O), a nonelectrolyte, in 254 g water. (The vapor pressure of pure water is 23.8 torr at 25Â°C and 71.9 torr at 45Â°C.) Calculate the vapor pressure of this solution at 25Â°C. Vapor pressure = torr Calculate the vapor pressure of this solution at 45Â°C. Vapor pressure = torr 3,A solution is prepared by dissolving 22.6 g urea, (NH2)2CO, in 150.0 g water. Calculate the boiling point of the solution. Urea is a nonelectrolyte. (This problem requires values in your textbook's specific appendices, which you can access through the OWLv2 MindTap Reader. You should not use the OWLv2 References' Tables to answer this question as the values will not match.) Boiling point = Â°C 4, What mass of glycerin (C3H8O3), a nonelectrolyte, must be dissolved in 200.0 g water to give a solution with a freezing point of â2.30Â°C? (This problem requires values in your textbook's specific appendices, which you can access through the OWLv2 MindTap Reader. You should not use the OWLv2 References' Tables to answer this question as the values will not match.) Mass = g

a mixture is made by mixing 500mL of substance x, an electrolyte with a van't hoff factor of 2 ( density = 1.25 g/mL;Molar mass = 55.00g/mol) and 1000mL of water (density=1.00g/mL) at 20 degrees celsius .The density of the mixture is 1.114g/mL. express the concentration of substance x as

a) volume percent

b) molarity

c)molality

D) mole fraction

Given the vapor pressure of pure water at 20degrees celsius is 17.5 torr. what is the freezing point of the solution? (water Kf=1.86)

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