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Question Number 23863 by Tinkutara last updated on 08/Nov/17

From the following data, calculate the  enthalpy change for the combustion of  cyclopropane at 298 K. The enthalpy  of formation of CO_2  (g), H_2 O (l) and  propene (g) are −393.5, −285.8 and  20.42 kJ mol^(−1)  respectively. The  enthalpy of isomerisation of cyclopropane  to propene is −33 kJ mol^(−1) .

$$\mathrm{From}\:\mathrm{the}\:\mathrm{following}\:\mathrm{data},\:\mathrm{calculate}\:\mathrm{the} \\ $$$$\mathrm{enthalpy}\:\mathrm{change}\:\mathrm{for}\:\mathrm{the}\:\mathrm{combustion}\:\mathrm{of} \\ $$$$\mathrm{cyclopropane}\:\mathrm{at}\:\mathrm{298}\:\mathrm{K}.\:\mathrm{The}\:\mathrm{enthalpy} \\ $$$$\mathrm{of}\:\mathrm{formation}\:\mathrm{of}\:\mathrm{CO}_{\mathrm{2}} \:\left({g}\right),\:\mathrm{H}_{\mathrm{2}} \mathrm{O}\:\left({l}\right)\:\mathrm{and} \\ $$$$\mathrm{propene}\:\left({g}\right)\:\mathrm{are}\:−\mathrm{393}.\mathrm{5},\:−\mathrm{285}.\mathrm{8}\:\mathrm{and} \\ $$$$\mathrm{20}.\mathrm{42}\:\mathrm{kJ}\:\mathrm{mol}^{−\mathrm{1}} \:\mathrm{respectively}.\:\mathrm{The} \\ $$$$\mathrm{enthalpy}\:\mathrm{of}\:\mathrm{isomerisation}\:\mathrm{of}\:\mathrm{cyclopropane} \\ $$$$\mathrm{to}\:\mathrm{propene}\:\mathrm{is}\:−\mathrm{33}\:\mathrm{kJ}\:\mathrm{mol}^{−\mathrm{1}} . \\ $$

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