CHEM 107 Final: CHEM 107 TAMU Final Exam S18 Solutions

Ill. (15 pts) Stereochemistry of organic molecules. Consider 12-19 when answering 11-15 CI CH, CHCH 14 12 13 15 CH, CI 19 16 17 18 11. Which pair are constitutional isomers to each other? A) 14 and 16 8) 17 and 19 C) 15 and 18 D) 12 and 15 12. Which pair are conformational isomers to each other? A) 14 and 16 B) 13 and 19 C) 16 and 19 D) 14 and 17 13. Which pair are diastereomers to each other? A) 14 and 17 8) 17 and 18 C) 15 and 16 D) 18 and 19 14. Which pair are enantiomers to each other? A) 14 and 17 B) 13 and 18 C) 16 and 19 D) 17 and 18 15. Which pair are identical in both conformation and configuration to each other? A) 16 and 19 B) 16 and 18 C) 14 and 19 D) 13 and 18

Chem 107 Exam IL, Page 5 of 12 Oct 19, 2017 A. 10 C B. 40°C C. 146°C D. 313°C E. 685°C 16. (3 points) Which one of these gases is "lighter-than-air"? A. CZ B. SO2 C. PH D. NO E. Ne 17, (3 points) Two moles of chlorine gas at 200°C are beated to 350°C while the volume is doubled. The density of the gas A. incresse B. decrease C. depends on the pressure D. remains the same E. Not enough information is given to cotrectly answer the question. 18. (3 points) Determine the molar mass of chiloroforms gas if a sample weighing 0.389 g is collected in a Bask with a volume of 102 cm at 97 C. The pressure of the chlorofoem is 728 mmHg. A. 187g/mol B. 121 g/mol C. 1.12 × 102g/mol D. 8.28×10-3g/mol E. 31.6g/mol 19. (3 points) A sample of hydrogen gas was collected over water at 21 °C and 685 mmHg. The volume of the container was 7.80L. Calculate the mass of Ha() collected. (Vapor pressure of water 18.6 mmlg at 21 C.) A. 0.283g B. 0.571g C. 0.589g D. 7.14g

Chem 114 Spring 2018 Midterm Exam methanol propane 12. If you mix 2g of salicylic acid with 20 ml of t-butyl alcohol. Which substance is the solvent and which one is the solute in this experiment? 13. Calculate the molarity and the molality of a solution prepared by dissolving 3.60 g of ethanol (C2HsOH) with 100.0 g of water to give a final volume that is 102 ml. 14. What is the freezing point of the solution when 15.00 g of ethylene glycol (C2H&02) is dissolved in 148.0 g of pure water? (The freezing point depression constant for water is 1.86 °C-kg/mol). 15) A solution containing 10.0 g of an unknown liquid and 90.0 g water has a freezing point of- 3.33°C. Given K 1.86°Cm for water, the molar mass of the unknown liquid is g/mol A) 69.0 B) 333 C) 619 D) 16 E) 62.1