OCR A AS Specimen Paper 1 Q24

Answers available below

24 Every year, two million tonnes of ethanol are produced worldwide by hydration of ethene obtained from 24 C2H4(g) + H2O(g) C2H5OH(g) H = 45 kJ mol1 This reaction is typically carried out using a catalyst at 300 C and 6000 kPa. (a) The catalyst allows the reaction to reach equilibrium more quickly at the given temperature and crude oil. [1] [2]pressure. (i) State the catalyst used in this reaction. (ii) Outline how a catalyst increases the rate of a chemical reaction. SPECIMENOCR 2014 H032/01<br /> 25 (b) An increasing amount of ethanol is made by the fermentation of glucose from plants, rather than by the hydration of ethene. Fermentation is catalysed by enzymes from yeast at a temperature of 40 C and a pressure of 100 kPa. C6H12O6(aq) (cid:111) 2C2H5OH(aq) + 2CO2(g) Compare the sustainability of each process for the manufacture of ethanol, by considering their:Suggest which process is the more sustainable. (cid:120) atom economies (cid:120) raw materials (cid:120) reaction conditions. SPECIMEN END OF QUESTION PAPER[4]OCR 2014 H032/01<br />

Show answer