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Mean bond enthalpies: C=C 612kJ/mol, C-C 348 kJ/mol, C-HkJ/mol, H-H 436kJ/mol, C(s) —> C(g) 715kJ/mol 1 - Calculate the enthalpy change for the dimerisation of ethene to give cyclobutane 2 C2H4(g) —> C4H8(g) 2 - Given that the mean enthalpy of the C-C and C-H bonds in cyclobutane are in fact 320kJ/mol and 412kJ/mol respectively, calculate the standard enthalpy of formation of cyclobutane.
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