Given : gathered H ^0 f _ of CO ₂( ~g )=-393.5 ~kJ / mol H ^0 _ f of H ₂ O ( l )=-286 ~kJ / mol H ^0 _ f of C ₃ H ₆( ~g )=+20.6 ~kJ / mol gathered H ^0 isomerisation of Cyclopropane to Propene =-33 ~kJ / mol What is the standard enthalpy of

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Given : gathered H ^0 f _ of CO ₂( ~g )=-393.5 ~kJ / mol H ^0 _ f of H ₂ O ( l )=-286 ~kJ / mol H ^0 _ f of C ₃ H ₆( ~g )=+20.6 ~kJ / mol gathered H ^0 isomerisation of Cyclopropane to Propene =-33 ~kJ / mol What is the standard enthalpy of combustion of Cyclopropane?

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Correct answer: C. -2092 kJ/mol

Combustion: C₃H₆(g) + 9 2 O₂(g) 3CO₂(g) + 3H₂O(l) H_f^0 of cyclopropane using isomerisation data: Cyclopropane Propene, H_ iso = -33 kJ/mol H_f^0 (Cyclopropane) = H_f^0 (Propene) - H_ iso = 20.6 - (-33) = 53.6 kJ/mol H_c^0 = [3 (-393.5) + 3 (-286)] - [53.6] = [-1180.5 - 858] - 53.6 = -2038.5 - 53.6 = -2092.1 -2092 kJ/mol

Given : gathered H ^0 f _ of CO ₂( ~g )=-393.5 ~kJ / mol H ^0 _ f of H ₂ O ( l )=-286 ~kJ / mol H ^0 _ f of C ₃ H ₆( ~g )=+20.6 ~kJ / mol gathered H ^0 isomerisation of Cyclopropane to Propene =-33 ~kJ / mol What is the standard enthalpy of combustion of Cyclopropane?

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