OCR A Jun 2013 Paper 2 Q8

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8 Poly(propenenitrile) is used to make acrylic fibres for clothing. Poly(propenenitrile) is a polymer manufactured from propenenitrile. 20 CN propenenitrile (a) Draw a section showing two repeat units of poly(propenenitrile). (b) Explain why this manufacture of poly(propenenitrile) has a 100% atom economy.[1] [1]OCR 2013<br />
 (c) Propenenitrile is manufactured from propene as shown in the equation. 21 C3H6(g) + NH3(g) + 1O2(g) CH2CHCN(g) + 3H2O(g) H = 540 kJ mol1 The conditions used are 450 C and 2.5 atmospheres in the presence of a catalyst. Describe and explain, using le Chateliers principle, the effect on the position of equilibrium of the following changes:a temperature above 450 C a pressure above 2.5 atmospheres the absence of a catalyst. In your answer you should link the effects you describe with your explanations.[5] Question 8 continues on page 22OCR 2013 Turn over<br />
 (d) A factory is able to make 11.13 kg of propenenitrile from 220 mol of propene. Calculate the percentage yield of the reaction to form propenenitrile from propene. 22 (e) The chemical industry uses temperature and catalysts to control the rate of reactions. percentage yield =% [2] Using Boltzmann distribution diagrams, explain the effect on the rate of a reaction of:increasing the temperature adding a catalyst.OCR 2013<br />
 23[7] [Total: 16] END OF QUESTION PAPEROCR 2013<br />

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