42) How much energy is required to vaporize 158 g of butane (C4H10) at its boili

Question

42) How much energy is required to vaporize 158 g of butane (C4H10) at its boiling point, if its AH vap is 24.3 kJ/mol? D) 2.60 A) 15.1 kJ 43) Dissolving can be defined as A) rate of dissolution rate of deposition B) rate of dissolution rate of deposition C) rate of dissolution rate of deposition D) rate of bubbling rate of dissolving E) rate of condensing rate of bubbling ple of water contains 0.0044 g ofCl ions. Determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g/mL E) 6.6 ppm D) 2.2 ppm B) 8.8 ppm A) 3.3 ppm 45) what volume of a 0.716 M KBr solution is needed to provide 30.5 g of KBr? C) 184 mL D) 357 mL. B) 42.7 mL A) 21.8 M 46) A solution is prepared by adding 1.43 mol of KCI to 889 g of water. The concentration of molal. KCI is A) 1.61 x 10-3 6222 C) 0.622 D) 1.27 x 103 E) 1.61 B) 47) What is the mole fraction of oxygen in a gas mixture that is 37% oxygen and 63% nitrogen by volume? D) 0.52 C) 0.25 A) 0.34 B) 0.37 48) A solution is 2.25% by weight NaHCO3. How many grams of NaHCO3 are in 150.0 g of solution? D) 225 g. B) 3.38 g A) 1.50 g 49) Choose the solvent below that would show the greatest boiling point elevation when used to make a 0.10 m nonelectrolyte solution. A) carbon tetrachloride, Kb 5.03 C/m B) benzene, Kb 2.53 Chm C) diethyl ether, Kb 2.02°C/m D) water, Kb 0.512 C/m E) acetic acid, Kb 3.070C/m

Explanation / Answer

42) Answer:- (B) 66.1KJ

Molar mass 58.12 g/mol

heat = (158/58.12) x 24.3KJ/mol = 66.06KJ

43) Answer:- (C)

Rate of dissolution > Rate of deposition

44) Answer:- (C) 4.4ppm

0.0044 g Cl- x (1000 mg / g ) = 4.4 mg Cl-

4.4 mg Cl- / 1.00 L solution = 4.4 ppm Cl-

45) Answer:- (D) 357mL

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