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CHM2045 Final Exam Review, Spring 2017 1. The combustion of 40.10 g of a compound which contains only C, H, Cl and O yields 58.57 g of CO2 and 14.98 g of H2O. Another sample of the compound with a mass of 75.00 g is found to contain 22.06 g of Cl. What is the empirical formula of the compound? If the molar mass of the compound is approximately 241 g/mol, what is the molecular formula of the compound? 2. A hydrate of Na2CO3 has a mass of 4.31 g before heating. After heating, the mass of the anhydrous compound is found to be 3.22 g. Determine the formula of the hydrate and then write out the name of the hydrate. 3. If volumes are additive and 95.0 mL of 0.55 M KBr is mixed with 165.0 mL of a BaBr2 solution to give a new solution in which [Br¯] is 0.65 M, what is the concentration of the BaBr2 used to make the new solution? 4. A certain metal oxide M2O5 is 41.91% Oxygen by mass. What is the identity of the metal M? CHM2045 Final Exam Review, Spring 2017 5. Solvay process for manufacturing carbonate involves two steps as follows: Step 1: H2O + NaCl + NH3 + CO2 NH4Cl + NaHCO3 Step 2: 2 NaHCO3 Na2CO3 + CO2 +H2O. What is the percent yield of sodium carbonate in the above process if 50.0 g of NaCl were used in Step 1 and 100.0 g of sodium carbonate were collected in Step 2? 6. Which of the following substances would be predicted to be the most soluble in hexane (C6H14)? (1) (2) (3) (4) (5) Diethyl ether, CH3CH2OCH2CH3 Rubidium chloride, RbCl Methanol, CH3OH Benzene, C6H6 Methylene Chloride, CH2Cl2 7. You wish to titrate a 100.0 mL sample of a diprotic acid (H2A) solution that is predicted to have a concentration of approximately 2.5 M. What volume and molarity of calcium hydroxide would you need for your titration? CHM2045 Final Exam Review, Spring 2017 8. Which oxide(s) form(s) acidic solutions when dissolved in water? I. II. III. IV. MgO SO3 Bi2O3 P4O10 9. Element X has the following valence electron configuration: [core]ns2np5. Element M has the following electron configuration [core]ns2. What ionic compound would most likely result from the reaction between ions of M and X? 10. A sample of methane in equilibrium with its vapor in a closed 4.0 L container has a vapor pressure of 50.0 torr. The container’s volume is increased to 2.0 L and the liquid/vapor equilibrium pressure is reestablished. What is the vapor pressure? 11. A metal crystallizes in a face-centered cubic lattice. The radius of the atom is 0.197 nm. The density of the element is 1.54 g/cm3. What is this metal? CHM2045 Final Exam Review, Spring 2017 12. What is the correct molecular geometry of the following, respectively? I. ICl4II. BrF5 III. XeCl2F2 IV. IOCl5 V. IF3 14. Ammonia is created in the Haber process in a rigid container at constant temperature: 3 H2 (g) + N2 (g) 2 NH3 (g) 12 moles of H2 gas are mixed with 5 moles of N2 gas. The Initial pressure exerted on the container is 4 atm. Assuming the reaction proceeds to completion, what will be the pressure exerted on the vessel after the reaction takes place? CHM2045 Final Exam Review, Spring 2017 15. Which of the following ideal solutions would be predicted to have the lowest freezing point? I. 0.10 m Na3PO4 II. 0.35 m NaCl III. 0.20 m MgCl2 IV. 0.15 m C6H12O6 V. 0.15 m CH3OH 17. What is the normal boiling point of a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K. 18. Determine the final temperature when 20.0 g of mercury at 165.0 °C mixes with 200.0 grams of water at 60.0 °C. (Cp for Hg = 0.14 J per gram degree Celsius.) CHM2045 Final Exam Review, Spring 2017 19. Which of the following compounds will exhibit resonance? I. CO3-2 II. O3 III. I3IV. HNO3 20. Use the following to calculate the lattice energy of NaCl: Na (s) Na (g) Cl2 (g) 2Cl(g) Na (g) Na+(g) + eCl (g) + e- Cl- (g) Na (s) + 1/2Cl2 NaCl (s) Hsub = 109 kJ HBE = 243 kJ HIE= 496 kJ HEA = -349 kJ Hrxn = -411 kJ 21. Here is the question: The energy from radiation can be used to cause the rupture of chemical bonds. A minimum energy of 941 KJ/mol is required to break the nitrogen-nitrogen bond in N2. What is the longest wavelength of radiation that possesses enough energy to break this bond? 22. A sample of iron was dissolved in hydrochloric acid to form iron (II) chloride and hydrogen gas. The liberated hydrogen gas was collected by displacement of water. The hydrogen occupied 500.0 mL at 30 °C. The barometric pressure was 760 torr. What mass of iron was dissolved? (VPH2O= 25 torr at 30 °C).