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   Katya Claros Professor Aouad September 24, 2014 CHEM 203 Part A: Scavenger Hunt in the Chemical Reference Books 1. a.   The180.6 has a tiny superscript to tell you that 180.6 °C is the boiling point at 18 torr.  b. Density. 1.280 20/4. Actually, this particular number is a specific gravity. This is a mass of the density of the liquid taken at 20°C referred to (divided by) the density of the same mass of water at 4°C. That's what the tiny 20/4 means. Notice the units will cancel. A number without the modifying fraction is a true density (in g/ml) at the temperature given. c. the subscript D refers to the yellow D-line of a sodium d. Sol= Alcohol. Ethyl alcohol; ethanol. Sol= ether. Diethyl ether; ethoxyethane. 2. Cinnamaldehyde is a consistent of Ceylon and Chinese cinnamon oils. a.   It ’ s molecular weight is 132.16 g/mol  b.   its formula is C9H8O its structure is c.   PREPARATION OF CINNAMALDEHYDE Henry H. Richmond, Guelph, Ontario, Canada, assignor to United States Rubber Company, New York, N. Y., a corporation of New Jersey  No Drawing. Application April 5, 1947, d.   It ’ s density, 1.05 g/cm³   e.   Boiling point is 248 ℃  f.   Its refractive index is n   = 1.60997 3.  tert-Butanol is a common name of 2-methyl-2-propanol. This compound is a liquid at 25 ℃  4. The common name for C6H4N2O6 is 2,4-DINITRORESORCINOL 5 three solvents in which 2,6-dinitrobenzaldehyde is soluble are: caustic alkalies   water    organic solvents   6. the cost of 500 mg of Glycyl-glycyl-glycyl-glycyl-glycine is $635.50 7. Diethyl ether is frequently used in extractions a. The flash point for Diethyl ether is -45 ℃ .  b. Extinguishing media recommended for Diethyl Ether are: water spray, water fog, dry chemical or carbon dioxide. 8. PERMISSIBLE EXPOSURE LIMITS FOR CHEMICAL CONTAMINANTS (PEL)  for Acentone:  ppm(e) mg/M3(f) Ceiling(g) 500 1200 3000 ppm PERMISSIBLE EXPOSURE LIMITS FOR CHEMICAL CONTAMINANTS (PEL)  for Bromine:  ppm(e) mg/M3(f) Ceiling(g) 0.1 0.7 C The more hazardous compound is  Bromine . Part B: Scavenger Hunt and Stoichiometry Calculations 1.   a.   Molar mass Prop = 44.10g therefore, 1 mole per 44.10g  b.   Density of bromine = 3.1028   g·cm − 3 Therefore 10ml = 31.028g Br2 From your balanced equation: 1mol Prop reacts with 2 mol Br2 to produce 1mol 2,2DBP + 2mol HBr Molar mass Br2 = 159.808g c. Checking for the limiting reactant: 44.1g prop reacts with 2*159.808 = 319.616g Br2 to produce 201.89g 2,2BDP + 161.824g HBr 31.028g Br2 reacts with 44.10/319.61*31.02 = 4.280g propane Br2 is the limiting reactant. d . Propane is in excess Substitute these values into mass equation: 4.280g propane reacts with 31.028g Br2 to produce 201.89/44.10*4.28= 19.59g 2,2DBP 161.824/44.1*4.28 = 15.705g HBr 4.28g Prop + 31.028g Br2 →   19.59g 2,2DBP + 15.705g HBr e . Theoretical yield of 2,2 DBP = 19.59g.
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