# 4. Aluminum chloride is 20.2% aluminum by mass. Calculate the mass of aluminum in a 35.0 gram sample of aluminum chloride.

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1 1. Calculate the molecular mass of table sugar sucrose (C 12 H 22 O 11 ). A amu C amu B amu D amu 2. How many oxygen atoms are in 34.5 g of NaNO 3? A atoms C atoms B atoms D atoms 3. Calculate the mass percent of oxygen in the amino acid, serine, which has the molecular formula C 3 H 7 NO 3. A. 0.46% C % B % D % 4. Aluminum chloride is 20.2% aluminum by mass. Calculate the mass of aluminum in a 35.0 gram sample of aluminum chloride. A g C g B g D g 5. A laboratory analysis of citric acid (compound responsible for the sour taste of lemons) determined the following mass percent composition 37.51% carbon, 4.20% hydrogen and 58.29% oxygen. Find the empirical formula. A. C 3 H 4 O 3 C. C 6 H 8 O 5 B. C 6 H 8 O 7 D. C 5 H 8 O 7

2 6. A compound has an empirical formula of CH 2 O and the molar mass of the compound is 180g/mol. What is the molecular formula? A. CH 12 O C. C 6 H 12 O 6 B. C 6 H 6 O D. C 12 H 24 O Consider the following unbalanced chemical equation. When properly balanced, what is the coefficient of HCl? A. 1 B. 2 C. 3 D. 4 HCl(aq) + O 2 (g) H 2 O(l) + Cl 2 (g) 8. How many moles of NaBr are needed to react with 0.75 moles of Fe according to the following reaction? Fe + 3NaBr FeBr 3 + 3Na A moles C moles B moles D moles 9. Urea (CH 4 N 2 O) is a common fertilizer that can be synthesized by the reaction of ammonia with carbon dioxide: 2NH 3 (aq) + CO 2 (aq) CH 4 N 2 O(aq) + H 2 O(l) Starting with 50.0 g of NH 3, how many grams of CO 2 are required for the NH 3 to be completely consumed? A g C g B. 129 g D g

3 10. When 25.2 grams of methane (CH 4 ) reacts with an excess of oxygen, according to the following reaction, 45.8 grams of water are collected. What is the percent yield? CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O(l) A. 80.9% C % B % D % 11. How many liters of a 0.225M NaOH solution contain mol of NaOH? A L C L B L D L 12. A solution of M KOH is diluted from 1.32 L to 2.4 L. What is the final concentration of KOH? A M C M B. 3.1 M D M 13. Which one of the following product compounds would precipitate in an aqueous reaction? A. Li 2 SO 4 C. Al 2 (SO 4 ) 3 B. ZnSO 4 D. BaSO What is the net ionic equation resulting from the mixture of aqueous solutions of silver nitrate and potassium sulfide? A. 2Ag + (aq) + NO 3 (aq) + 2K + (aq) + S 2 (aq) Ag 2 S(s) + 2K + (aq) + NO 3 (aq) B. 2Ag + (aq) + S 2 (aq) Ag 2 S(s) C. 2Ag + (aq) + 3NO 3 (aq) + 2K + (aq) + S 2 (aq) Ag 2 S(s) + 2KNO 3 (s) D. NO 3 (aq) + K + (aq) KNO 3 (aq)

4 15. Solutions of calcium hydroxide, Ca(OH) 2, and sodium phosphate, Na 3 PO 4, are mixed. Write the balanced complete ionic equation for the reaction: Ca(OH) 2 (aq) + Na 3 PO 4 (aq) A. Ca 2+ (aq) + 2OH (aq) + 3Na + (aq) + PO 4 3 (aq) 3Na + (aq) + 2OH (aq) + CaPO 4 (s) B. 3Ca 2+ (aq) + 2OH (aq) + 3Na + (aq) + 2PO 4 3 (aq) 3Na + (aq) + 2OH (aq) + Ca 3 (PO 4 ) 2 (s) C. 3Ca 2+ (aq) + 6OH (aq) + 6Na + (aq) + 2PO 4 3 (aq) 6Na + (aq) + 6OH (aq) + Ca 3 (PO 4 ) 2 (s) D. 3Ca 2+ (aq) + 2PO 4 3 (aq) Ca 3 (PO 4 ) 2 (s) 16. It requires ml of M sodium hydroxide to neutralize ml of a sulfuric acid (H 2 SO 4 ) solution. Determine the concentration of the sulfuric acid (H 2 SO 4 ) solution. A M C M B M D M 17. What is the oxidation number of sulfur in SO 4 2? A. +4 C. +6 B. 2 D Which of the following are redox reactions? I. CuSO 4 + 2NaOH Cu(OH) 2 + Na 2 SO 4 II. 2Al + 3MgSO 4 3Mg + Al 2 (SO 4 ) 3 III. 2(NH 4 ) 3 PO 4 + 3Ba(NO 3 ) 2 Ba 3 (PO 4 ) 2 + 6NH 4 NO 3 IV. 2HNO 3 + 3H 3 AsO 3 2NO + 3H 3 AsO 4 + H 2 O A. I and II C. All of them B. III and IV D. II and IV

5 19. Convert 32 pounds per square inch (psi) into mmhg. (Note: 14.7 psi = 1 atm, 1 Pa = 1N/m2, 1 atm = Pa, 1mmHg = 1 torr) A mmhg C mmhg B mmhg D. 2.2 mmhg 20. A balloon has an initial volume of 3.45 L. What will the volume be if the temperature is raised from 24 C to 32 C? A L C L B L D L 21. What is the volume occupied by 20.0 g of argon gas at a pressure of 1.05 atm and a temperature of 25.0 C? A L C. 466 L B L D L 22. Determine the density in g/l of an unknown gas given that a 14.5 gram sample contains 2.00 moles at 25 o C and 745 mmhg. A g/l C g/l B g/l D g/l 23. A 1.00 L mixture of helium, hydrogen, and xenon gas has a total pressure of 645 torr at 298 K. If the partial pressure of helium is 341 torr and the partial pressure of hydrogen is 112 torr, how many moles of xenon are present in the mixture? A mol C mol B mol D mol

6 24. The following equation shows the combustion of methane. CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O(g) If 6.0 g of CH 4 reacts completely, what is the final pressure of the CO 2 produced and collected in a 1.4 L container at a temperature of 21 o C? A. 3.8 atm C. 13 atm B. 6.5 atm D atm 25. Under which conditions would ammonia (NH 3 ) behave more like an ideal gas? A. High pressure and low temperature C. Low pressure and low temperature B. High pressure and high temperature D. Low pressure and high temperature 26. Which one of the following statements is true? A. Chemical energy is associated with the motion of molecules in a gaseous sample. B. Potential energy of molecules is based on composition. C. An object will always have the same amounts of kinetic and potential energy. D. The amount of energy in the universe is always decreasing. 27. Pieces of dry ice (solid CO 2 ) were placed inside of an empty plastic bag. The bag was then closed, and a book was placed on top of the bag. After a while, dry ice absorbed the heat inside of the bag and became CO 2 gas, and the book was raised up to 10 cm. What are the signs for work (w) and heat (q) for the system? A. w is positive, q is positive C. w is negative, q is positive B. w is positive, q is negative D. w is negative, q is negative

7 28. A system absorbs kj of heat as it expands to do 592 J of work (by the system) on the surroundings. What is the change in internal energy of the system? A kj C kj B kj D kj 29. In recent years, scientists have become concerned about the quantity of which one of the following gases rising in the atmosphere and trapping heat, thus causing global warming? A. CO C. NO 2 B. CO 2 D. CF What are the correct coefficients to balance the following equation and what is the oxidation number for Mn on the left (reactant)? KMnO 4 + HCl KCl + MnCl 2 + H 2 O + Cl 2 A. (1,8,1,1,7,3) ; 7 C. (2,16,6,4,7,2) ; +2 B. (2,16,2,2,8,5) ; +7 D. (4,8,1,4,10,7) ; +7

8 CHE 105 FALL 2012 Exam 2 key 1. A 2. C 3. D 4. C 5. B 6. C 7. D 8. D 9. A 10. A 11. A 12. A 13. D 14. B 15. C 16. A 17. C 18. D 19. C 20. A 21. B 22. D 23. D 24. B 25. D 26. B 27. C 28. A 29. B 30. B

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