Semester Practice with answers - Edubirdie

University:
Winston-Salem Forsyth County Schools
Course:
AP Chemistry
Academic year:

2012
Views:

144

Pages:

1
Author:

scu214ss

Problem 1: Citric Acid Question: Citric acid (C₆H₈O₇) is neutralized by NaOH. A 0.250 gram sample of citric acid requires 37.2 ml of 0.105 M NaOH. How many acidic hydrogens does citric acid have? Answer: 3 protons Problem 2: Mixture of Na₂SO₄ and K₂SO₄ Question: A mixture of Na₂SO₄ and K₂SO₄ is reacted with BaCl₂ to form a precipitate of BaSO₄. A 0.205 gram sample of the mixture produces 0.298 grams of BaSO₄. Calculate the mass percent of sulfate ions and the mole fraction of K₂SO₄ in the sample. Answer: Mass percent of sulfate ions: 56% Mole fraction of K₂SO₄: 0.609 Problem 3: Compound M₂S Question: M₂S is heated in air to form MO₂. A 4.000 gram sample of M₂S loses 0.277 grams when heated. Calculate the atomic mass of M. Answer: 181 g/mol Problem 4: Compound with C, H, O, and N Question: A compound containing C, H, O, and N is combusted and analyzed. 0.157 grams of the compound produces 0.213 grams of CO₂ and 0.0310 grams of H₂O. 0.103 grams of the compound produces 0.0230 grams of NH₃. Determine the empirical formula of the compound. Answer: C₇H₅O₃N₃ Problem 5: Mixture of BaO and CaO Question: A mixture of BaO and CaO reacts with CO₂ to form BaCO₃ and CaCO₃. A 5.14 gram sample of the mixture reacts in a 1.50 L flask at 30.0°C and 750 torr. The pressure after the reaction is 230 torr. Calculate the mass percentages of BaO and CaO in the mixture. Answer: Mass percent of BaO: 86.6% Mass percent of CaO: 13.27%

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