A chemist is given a white solid that is suspected of being pure cocaine. When 1.22 g of the solid is dissolved in 15.60 g of benzene, the freezing point is lowered by 1.32"C Calculate the molar mass of the solid. The molal freezing point constant (Kf) for benzene is 5 12"C/m 1 points Save Answer OA 283 g/mol OB 293 g/mol Oc 273 g/mol OD 303 g/mol OE hone of these

The vapor pressure of methanol at 21.20°C is 101.0 torr. What is the vapor pressure of a solution of 2.000 g of aspirin (MM = 180.15 g/mol) in 50.00 g of methanol (MM = 32.04 g/mol) at this temperature? Answer Options: A. 100.3 torr B. 3.885 torr C. 0.7187 torr D. 108.7 torr

The normal boiling point of a certain liquid X is 128.10 °C, but when 35.3 g of urea (CH4N2O) are dissolved in 350. g of X the solution boils at 130.9 °C instead. Use this information to calculate the molal boiling point elevation constant K, of X. Round your answer to 2 significant digits. °C-kg ☐ x10 K-0 = mol 5

What is the freezing point of a solution made by dissolving 45.0 g of glucose (C2H12O6) in 500. g of water? The freezing point depression constant, Kf, of water is 1.86 °C/m and the molar mass of glucose is 180.0 g/mol.   ΔTf = Kf m i   a. -0.465°C   b. -0.620°C   c. -1.86°C   d. -0.930°C

An aqueous solution has a normal boiling point of 103.5°C. What is the freezing point of this solution? For water Kb = 0.51°C/m and Kf = 1.86°C/m. O +13°C -3.5°C O-0,96°C +3.6°C -13°C

1.613 g sample of an unknown nonionizing molecular compound is added to 250.0 g of benzene(C6H6, MW = 78.11 g/mol). The normal freezing point of the solution is 0.17 C lower than the normalfreezing point of pure benzene. Based on this information, find the molecular weight of the unknowncompound. benzene =  Kf = 5.12 kg x Degrees C/mol.

A 5.67 gram sample of a compound is dissolved in 250 grams of benzene. The freezing point of this solution is 1.02°C below that of pure benzene. What is the molar mass of this compound? (Note: Kf for benzene = 5.12°C/m.) Ignore significant figures for this problem. 4.52 g/mol А. 56.9 g/mol В. 114 g/mol С. 28.5 g/mol D. OE. 228 g/mol