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27. What is molality of a solution prepared by dissolving 76.5 g of KOH in 525 g of water? A) 2.59 m B) 1.46 m C) 3.86 m D) 4.67 m 28. What is final molarity of a solution prepared by adding 250 mL of water to 350 mL of 3.40 M solution of NaCl? A) 4.76 M B) 1.98 M C) 2.43 M D) 1.60 M 29. How many milliliters of water you need to add to 500. mL of 3.50 M solution of sodium hydroxide, to dilute it to 1.60 M? A) 645 mL B) 1094 mL C) 594 mL D) 394 mL 30. What is molarity of hydrochloric acid if 50.0 mL of this acid neutralize 40.0 mL of 2.30 M sodium hydroxide? A) 2.30 M B) 1.84 M C) 3.50 M D) 1.20 M 31. How many milliliters of 2.60 M sulfuric acid are needed to neutralize 55 mL of 3.00 M sodium hydroxide? A) 31.7 mL B) 63.5 mL C) 15.9 mL D) 47.7 mL 32. Aqueous ammonia is commercially available in a solution that is 38% (w/w) ammonia. What is the mole fraction of ammonia in such a solution? A) 0.235 B) 0.568 C) 0.610 D) 0.394 33. What is molality of a solution prepared by dissolving 124 grams of NaCl in 750. g of water? Molar mass of NaCl is 58.44 g/mol. A) 1.65 m B) 2.14 m C) 2.85 m D) 1.59 m