The common laboratory solvent chloroform is often used to purify substances dissolved in it. The vapor pressure of chloroform , CHCI3, is 173.11 mm Hg at 25 °C. In a laboratory experiment, students synthesized a new compound and found that when 7.339 grams of the compound were dissolved in 176.5 grams of chloroform, the vapor pressure of the solution was 170.01 mm Hg. The compound was also found to be nonvolatile and a non- electrolyte. What is the molecular weight of this compound? chloroform = CHCI3 = 119.40 g/mol. MW = g/mol

A chemistry student weighs out 0.084 of an unknown solid compound X and adds it to 350. mL of distilled water at 23. C. After 10 minutes of stirring, only some of the X has dissolved. The student drains off the solution, then washes, dries and weighs the X that did not dissolve. It weighs 0.042 kg. Using only the information above, can you calculate the solubility of Xin water at 23.° C ? If you said yes, calculate it. Be sure your answer has a unit symbol and the right number of significant digits. 0 yes no x10 ロ・ロ X 00

A solid consists of a mixture of NaNO3 and Mg(NO3)2. When 6.50 g of the solid is dissolved in 50.0 g of water, the freezing point of the solution is lowered by 5.28°C. What is the composition by mass of the solid? g NaNO3 g Mg(NO3)2

The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is aspirin.Calculate the vapor pressure of the solution at 25 °C when 10.17 grams of aspirin, C9H8O4 (180.1 g/mol), are dissolved in 151.7 grams of diethyl ether.diethyl ether = CH3CH2OCH2CH3 = 74.12 g/mol.

The freezing point of benzene, C6H6, is 5.500 °C at 1 atmosphere. Kf(benzene) = 5.12 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.25 grams of the compound were dissolved in 246.9 grams of benzene, the solution began to freeze at 4.725 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound? g/mol

Consider a body of water in equilibrium with solid calcium sulfate, CaSO4, for which Ksp = 3.0 * 10^-5 at 35 degrees C. Calculate the solubility, in g/L of calcium sulfate in water assuming that other reactions are negligible.

The freezing point of benzene, C,Hg, is 5.500 °C at 1 atmosphere. Kf(benzene) = 5.12 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.39 grams of the compound were dissolved in 298.4 grams of benzene, the solution began to freeze at 4.703 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound? g/mol

Calculate the vapor pressure of ethanol, CH₃CH₂OH, in a water solution containing 72.5% ethanol by volume at 19.0 °C. The vapor pressure of pure ethanol at 19.0 °C is 40.0 Torr. The density of ethanol is 0.789 g·mL⁻¹ and the density of water is 1.000 g·mL⁻¹.

A student dissolves 20. g of benzoic acid (C,H,O,) in 125. mL of a solvent with a density of 1.07 g/mL. The student notices that the volume of the solvent does not change when the benzoic acid dissolves in it. Calculate the molarity and molality of the student's solution. Be sure each of your answer entries has the correct number of significant digits. molarity Ox10 molality %D

Use the graph to estimate the solubility of NANO3 in water at 40 °C. * Effect of temperature on solubility 160 KNO, 140 NANO, 120 100 KBr- 80 NH,CI 60 Na,So, 40 NaCI 20 10 20 30 40 50 60 70 80 90 Temperature (°C) 68 g/100 g H20 O 77 g/100 g H20 96 g/100 g H20 O no solubility Concentration (g/100 g H;0)