AQA Jun 2017 Paper 1 Q2

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0 2 0 2 This question is about energetics. . 1 Write an equation, including state symbols, for the reaction with an enthalpy change equal to the enthalpy of formation for iron(III) oxide.[1 mark] Table 2 contains some standard enthalpy of formation data. Table 2 fH o / kJ mol1 CO(g) 111 Fe2O3(s) 822 Fe2O3(s) + 3CO(g)2Fe(s) + 3CO2(g) Use these data and the equation for the reaction of iron(III) oxide with carbon monoxide to calculate a value for the standard enthalpy of formation for carbon dioxide. Show your working. H = 19 kJ mol1 [3 marks] 0 2 . 2 fH o kJ mol1 *04* IB/M/Jun17/7404/1<br /> Some enthalpy data are given in Table 3. Table 3 Process H / kJ mol1 N2(g) + 3H2(g)2NH3(g) N2(g)2N(g) H2(g)2H(g) 92 +944 +436 0 2 . 3 0 2 . 4 *05* Use the data from Table 3 to calculate the bond enthalpy for NH in ammonia. [3 marks] NH bond enthalpy kJ mol1 Give one reason why the bond enthalpy that you calculated in Question 2.3 is different from the mean bond enthalpy quoted in a data book (388 kJ mol1). [1 mark] Turn overIB/M/Jun17/7404/1<br />

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