CIE Jun 2013 v1 Paper 2 Q2

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Examiners For Use Ammonium nitrate fertiliser is manufactured from ammonia. Therst reaction in the manufacture of the fertiliser is the catalytic oxidation of ammonia to form nitrogen monoxide, NO. This is carried out at about 1103 kPa (10 atmospheres) pressure and a temperature of 700 to 850 C. 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g) H = 906 kJ mol1 (a) Write the expression for the equilibrium constant, Kp, stating the units. Kp = units[2] (b) What will be the effect on the yield of NO of each of the following? In each case, explain your answer. (i) increasing the temperature(ii) decreasing the applied pressure[4]UCLES 2013 9701/21/M/J/13<br /> Examiners For Use (c) The standard enthalpy changes of formation of NH3(g) and H2O(g) are as follows. NH3(g), Hf = 46.0 kJ mol1 H2O(g), Hf = 242 kJ mol1 Use these data and the value of given below to calculate the standard enthalpy change of formation of NO(g). Include a sign in your answer. 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g) H = 906 kJ mol1 [4] [Total: 10]UCLES 2013 9701/21/M/J/13 [Turn over<br />

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