The standard enthalpy of vaporization (H°vap) of diethylether ((CH3CH2)2O) is 29.1 kJ/mol. The normal boiling point of diethylether is 34.5°C. Calculate the vapour pressure of diethylether at 19.0°C. (Units of pressure can be atm, torr, mmHg, Pa, kPa, bar, etc. -- units are always case sensitive)

C2.

The common laboratory solvent benzene is often used to purify substances dissolved in it. The vapor pressure of benzene, C6H6, is 73.03 mm Hg at 25 °C. In a laboratory experiment, students synthesized a new compound and found that when 26.92 grams of the compound were dissolved in 223.1 grams of benzene, the vapor pressure of the solution was 71.14 mm Hg. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight of this compound? (Benzene = C6H6 = 78.12 g/mol) Molecular weight = g/mol

The molal boiling point constant for water is 0.52C/m. At what temp will a mixture of 105.0g of NaCl and 0.450 kg of water boil?

10.The diagram below is an example of Liquid-Solid-Temperature Composition Phase Diagram of Completely Immiscible Solids. The left vertical line is B rich while the right vertical line is A-rich.Define the phases present in the region from A to E. |LS – TZ Phase Diagram: Completely Immiscible Solids This LS- TZ phase diagram is for completely immiscible solids. XA = 0 X = 1 XA = 1 X = 0 T =T?, At the solid phase, the system consists of 2 distinct solids A and B. T= T At the liquid phase, the system is called a melt. At the 2- phase regions, the system consists of either pure solid A or B and the melt. The composition of A in the melt can be traced along the liquidous curve. T T= Teu E At the solidous line, the system consists of solids A, B, and melt in which the composition of A, or y =1 Z, can be determined. Ya = 0 Zeut,a Za YA =1 Yn = 0 At the eutectic composition, minimum temperature is required to melt the mixture.

10. A piece of sodium metal reacts completely with water as follows: 2Na) + 2H2OM > 2NªOH(aq) + H2) The hydrogen gas generated is collected over water at 25.0°C. The volume of the gas is 246 mL measured at 1.00 atm. Calculate the number of grams of sodium used in the reaction. (Vapour pressure of water at 25.0°C = 0.0313 atm)

The boiling point of water, H,0, is 100.00°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in water is antifreeze (ethylene glycol). A student dissolves 11.07 grams of antifreeze, CH2OHCH2OH (62.10 g/mol), in 299.3 grams of water. Use the table of boiling and freezing point constants to answer the questions below. Kf Solvent Formula (°C/m) (°C/m) Water H2O 0.512 1.86 Ethanol CH;CH,OH 1.22 1.99 Chloroform CHCI3 3.67 Benzene CH6 2.53 5.12 Diethyl ether CH;CH,OCH2CH3 2.02 The molality of the solution is m. The boiling point of the solution is °C.

A chemistry student is given 800. mL of a clear aqueous solution at 27.° C. He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 27.° C. The solution remains clear. He then evaporates all of the water under vacuum. A precipitate remains. The student washes, dries and weighs the precipitate. It weighs 7.2 g. Using only the information above, can you calculate the solubility of X in water at 27.° C ? If you said yes, calculate it. Be sure your answer has a unit symbol and the right number of significant digits. O yes Ono x10 4 0.0 X P * 010 3 olo Ar B M

The solubility of CaSO4 in water is 4.9×10-3 M at 25°C. Calculate Ksp for CaSO4 at this temperature

(Clausius Clapeyron) I have no idea what I’m doing wrong, perhaps it’s the units.