If you place 1.4 L of ethanol ( C2 H; OH) in a small laboratory that is 3.0 m long, 2.0 m wide, and 2.0 m high, will all the alcohol evaporate? If some liquid remains, how much will there be? The vapor pressure of ethyl alcohol at 25 °C is 59 mm Hg, and the density of the liquid at this temperature is 0.785 g/cm³. O the alcohol will evaporate. Volume remaining = L

Suppose a 250. mL flask is filled with 0.60 mol of N₂ and 0.40 mol of O₂. The following reaction becomes possible: N₂(g) + O₂(g) → 2NO(g) The equilibrium constant K for this reaction is 9.69 at the temperature of the flask. Calculate the equilibrium molarity of N₂. Round your answer to two decimal places. X

A hard water sample contains 0.0085% Ca by mass (in the form of Ca2 + ions). How much water (in grams) contains 1.2 g of Ca? (1.2 g of Ca is the recommended daily allowance of calcium for adults between 19 and 24 years old.)

A chemistry student is given 5.00 L of a clear aqueous solution at 25.° 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 15.° C. At that point, the student sees that a precipitate has formed. He transfers the liquid to a clean new beaker and throws away the precipitate. The student then evaporates the water from the liquid in the new beaker under vacuum. It weighs 1.00 kg. Using only the information above, can you calculate the solubility of Xin water at 15.° 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 X Olo S U 2

13) The solubility of O₂ in water is approximately 0.00380 g L-1 when the temperature is 25.0°C and the partial pressure of gaseous oxygen is 760. torr. What will the solubility of oxygen be if the oxygen pressure is adjusted to 1000 torr? A) 1.49 g L-1 B) 0.00289 g L-1 C) 0.00500 g L-¹ D) 2.89 x 103 g L-1 E) 3.46 x 103 g L-1 13)

Calculate the vapor pressure (in atm) of pure water at 80.0°C. For water, ΔHvap = 40.7 kJ/mol, R = 8.314 J/K-mol

Grams of solute /100 g H,0 NH, 3 can be supported by the solu- Which inference about bility curves shown? Solubility Curves 150 140 KI 130 120 NANO, KNO 110 100 90 80 HCI NH.CI 70 60 KCI NH, 50 40 NaCI 30 KCIO 20 10 10 20 30 40 50 60 70 80 90 100 Temperature °C

128 CHAPTER 5 3. A chart of vapor pressure information at different temperatures for various liquids is given below. Vapor Pressure (torr) Temperature Water Ethyl Alcohol Carbon Tetrachloride O'H 4. 24 (C) HOʻHƆ 12 34 0. 25 116 09 224 95 316 75 294 675 731 760 1723 1486 The questions below refer to the following experiment: three flasks, each containing one of the three liquids listed in the table are hooked to a vacuum pump. The pressure in each flask is reduced to 50 torr and the temperature of each flask is maintained at 25°C. blano (b) (a) Under these conditions, which liquid(s) would you observe boiling? Explain. (b) Explain why, if both liquids are maintained at 25°C, the vapor pressure of CCI, is higher than the vapor pressure of C,H,OH. Refer to both molecules in your discussion. CH H'C CH enstud-S-otoahib-CS-uot OBO 2ADI ud,8gada al sanm alom omss odi ovard asonatadue dhol () palom alimis bas Dwal s ad mot ab at a tmioq gaiilam Dwal inlqx ToonanoROT atidio ym li mol diW )…

Calculate the dissolved oxygen in mg/L at an altitude of 1,000 m above sea level that has an atmospheric pressure of 0.89 atm; assuming constant temperature of 25 °C. The Henry Law constant (kH) for the solubility of O2 in water at 25 ° C is 1.3 x 10-3 mol/L.atm.

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