Question 5 (5 points) The normal freezing point of benzene (CgH6) is 5.48°C. The normal freezing point of a solution prepared by dissolving 2.00 g of a covalent compound in 100.0 g of benzene is 5.08°C. what is the molar mass of the compound? For benzene, Kf = 5.12 °C/m. Hint: The covalent compound does not dissociate in benzene a) 130 g/mol b) 260 g/mol c) 2600 g/mol d) 26 g/mol 1240 AM 9/6/2017 ^脈
5) Tf = Kf x m
Tf = 5.48 – 5.08 = 0.4
m = Tf / Kf = 0.4 / 5.12 = 0.078
molality = (W/MW) (1000 / mass of solvent in g)
0.078 = (2.0 / MW) (1000 / 100)
2.0 / MW = 0.0078
MW = 256.41 g /mol
6) = iCRT
= osmotic pressure = ?
i = 5 (Al2(SO4)3 gives 5 ions)
C = 0.01 M
R = 0.0821
T = 298 K
= 5 x 0.01 x 0.0821 x 298
= 1.22 atm
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