29) 23) Which one of the following is most soluble in water? A) CHCHCHOH B) CHCHCHCHOH C) CHOH D) CHCHOH E) CHCHCHCHCHOH 24) The solubility of nitrogen gas at 25 C and 1 atm is 65 x 10-4 mol/L. If the partial pressure of nitrogen gas in air is 0.76 atm, what is the concentration (molarity) of dissolved nitrogen? A) 6.8 x 10-4 M B) 5.2 x 10-4 M C) 1.1 X 10-5 M D) 3.8 x 10-4 M E) 4.9 x 10-4 M ABCDE 25) A solution contains 28% phosphoric acid by mass. This means that A) 1 L of this solution contains 28 ml. of phosphoric acid B) 1 mL of this solution contains 28 g of phosphoric acid C) 100 g of this solution contains 28 g of phosphoric acid D) the density of this solution is 2.8 g/ml. E) 1 L of this solution has a mass of 28 g 23) 26) Calculate the molality of a 25.4% (by mass) aqueous solution of phosphoric acid (H3PO4). A) 25.4 m B) 3.47 m C) 2.59 m D) 4.45 m E) The density of the solution is needed to solve the problem. 271 A sample of rubbing alcohol contains 142.0 g of isopropanol (CH,OH) and 58.0 g of water. The mole fractions of alcohol and water are A) 2.36 and 3.22 - B) 0.423 and 0.577 C) 0.236 and 0.322 D) 0.577 and 0.423 E) 0.733 and 1.324 Hydride 24) 26) 281 The vapor pressure of pure water at 26C is 25.21 torr. What is the vapor pressure of a in 80 g of water? solution that contains 16.0 g of glucose (C6H2O6) dissolve A) 16.8 torr B) 24.7 torr C) 0.49 torr D) 25.4 torr E) 14.1 torr What would be the osmotic pressure at 65C of an aqueous solution containing 2.50 g of sucrose (C12H22O1) per 205 mL of solution? A) 0.989 atm B) 0.192 atm C) 0.812 atm D) 0.338 atm E) 1.450 atm