PracticeExam1b_AnswerKey

PracticeExam1b_AnswerKey - Tufts University Chem 2 Summer...

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Tufts University – Chem 2 – Summer 2008 – Practice Exam 1b Answer Key 1
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II. Neutralization 50.0 mL of 20.0% H 2 SO 4 (aq) (d = 1.137 g/cm 3 ) were mixed with 20.0 mL of 17.8% NH 3 (aq) (d = 0.930 g/cm 3 ). The resulting solution was carefully evaporated, and a mixture of two anhydrous salts was obtained. a) Determine the identity and mass (in grams) of each salt. b) Calculate the normalities (N) of the starting solutions of H 2 SO 4 and NH 3 . 3
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III. Deicer How many kilograms of ice will melt if 1.00 kg of NaCl(s) is mixed with excess ice at a constant temperature of -5.00 ºC? Assume complete dissociation of NaCl in solution. (Note: K f for water is 1.86 ºC kg mol -1 ). IV. Henry’s constant The solubility of dinitrogen monoxide (N 2 O) in water at 0ºC is reported as 1.3 L in one liter of water at 1 atm pressure. (a) Calculate the Henry’s constant (k H ) for N 2 O at 0 ºC if the units for k H are mol L -1 atm -1 . (b) Do you expect the k H for N 2 O at 25ºC to be higher or lower than that at 0ºC? Explain.
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