Discussion - cyclohexane and dichlorobenzen cyclohexane...

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CHEM 2B C05 Jan 21 2010 1 1. The aqueous solubility of helium is 1.9 x 10 –4 M. the partial pressure of helium above the water is 0.5atm. what is the Henry’s law constant for helium in water? 2 . Magnesium chloride (MgCl 2 ) was added to 1kg of water to lower the freezing point of water by 1.5 C. Freezing point constant of water is 1.86 C Kg/mol A. Predict the van't Hoff factor for MgCl 2 in water B. Determine molarity of MgCl 2 solution C. Determine the amount (g) of MgCl 2 added to 1kg of water 3 . If the pure vapor pressures of benzene (C 6 H 6 ) and toluene (C 7 H 8 ) are P ben = 47.6torr and P tol = 14.2 torr, the total vapor pressure is P tot =41torr A. The mole fractions of benzene and toluene in the liquid phases B. The mole fractions of benzene and toluene in the vapor phases 4 . 0.5g of ρ‐ dichlorobenzene is completely dissolved in 10mL of cyclohexane. The freezing point for pure
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Unformatted text preview: cyclohexane and dichlorobenzen cyclohexane mixture are approached to 7.0 C and 2.0 C, respectively. Density of dichlorobenzene is 0.7726g/mL at 25 C. Determine: A. The molarity of the dichlorobenzene solution. B. The freezing point constant, K f , of cyclohexane. 5 . 0.5g of an unknown compound is added to 10mL cyclohexane in the freezing point apparatus. The freezing point for pure cyclohexane and unknown compound cyclohexane mixture are approached to 7.0 C and 0.5 C, respectively. Density of dichlorobenzene is 0.7726g/mL at 25 C. Determine molecular mass of solute (Kf(clycohexane)=20 C Kg/mol)...
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This note was uploaded on 01/26/2010 for the course CHE 2B 36001 taught by Professor Williamcasey during the Winter '09 term at UC Davis.

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