Organic Chemis

CHEMISTRY HIGHER direct PaPER 2 Monday 18 May 2009 (afternoon) 2 hours 15 proceeding INSTRUCTIONS TO CANDIDATES Write your posing number in the boxes above. Do non open this examination report until instructed to do so. Section A tell all of Section A in the spaces provided. Section B coiffure two questions from Section B. Write your answers on answer canvas tents. Write your session number on each answer sheet, and attach them to this examination paper and your cover sheet employ the tag provided. At the end of the examination, manoeuvre the numbers of the questions answered in the candidate box on your cover sheet and indicate the number of sheets used in the appropriate box on your cover sheet. Candidate session number 0 0 2209-6108 19 pages International Baccalaureate Organization 2009 0119 2 Section a response all the questions in the spaces provided. 1. M09/4/CHEMI/HP2/ENG/TZ1/XX+ Biodiesel makes use of plants ability to bring atmospheric light speed by photosy nthesis. Many companies and individuals are now using biodiesel as a fuel in order to reduce their carbon footprint.Biodiesel can be synthesized from vegetable oil according to the followingreaction. O H C O C R O H C O C R (l)+ 3CH3OH(l) O H C O C R H H H NaOH(s) H C OH H C OH (l)+3 CH3 H C OH H O O C R (l) vegetableoil (a) methanol glycerol biodiesel 1 Identifytheorganicfunctionalgrouppresentinbothvegetableoilandbiodiesel. .. (b) For part of her drawn-out essay investigation into the efficiency of the process, a student reacted a clear sample of a vegetable oil (where R=C17H33) with methanol. Therawdatarecordedforthereactionisbelow. Massofoil = 1013. g Massofmethanol = 200. 0g Massofsodiumhydroxide = 3. 5g Massofbiodieselproduced= 811. 0g Therelativemolecularmassoftheoilusedbythestudentis885. 6. Calculatetheamount (inmoles)oftheoilandthemethanolused,andhencetheamount(inmoles)ofexcess 3 methanol.