From the given data at 298 , K:Delta H_f^o [C | vedclass

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(B) The combustion reaction for $C_3H_6$ (propene or cyclopropane) is:$C_3H_6 (g) + 4.5 O_2 (g) 	o 3 CO_2 (g) + 3 H_2O (l)$First,calculate the enthal

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$-2093$

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(B) The combustion reaction for $C_3H_6$ (propene or cyclopropane) is:$C_3H_6 (g) + 4.5 O_2 (g) 	o 3 CO_2 (g) + 3 H_2O (l)$First,calculate the enthalpy of combustion for propene:$\Delta H^o_{comb} [propene] = [3 	imes \Delta H_f^o (CO_2) + 3 	imes \Delta H_f^o (H_2O)] - [\Delta H_f^o (propene)]$$\Delta H^o_{comb} [propene] = [3 	imes (-394) + 3 	imes (-286)] - [20]$$\Delta H^o_{comb} [propene] = [-1182 - 858] - 20 = -2040 - 20 = -2060 \, kJ/mol$Given the isomerisation reaction: $cyclopropane (g) 	o propene (g)$ with $\Delta H^o_{isomerisation} = -33 \, kJ/mol$.Using Hess's Law:$\Delta H^o_{comb} [cyclopropane] = \Delta H^o_{comb} [propene] + \Delta H^o_{isomerisation}$$\Delta H^o_{comb} [cyclopropane] = -2060 + (-33) = -2093 \, kJ/mol$.

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