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Why do mean bond enthalpy values differ from those calculated from enthalpy cycles ?

April 26, 2017Bond calculated Chemistry differ enthalpy Mathematics mean values

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Why do mean bond enthalpy values differ from those calculated from enthalpy cycles ?

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mean bond enthalpies ARE calculated by enthalpy cycles. In special cases the values calculated would not be standard values – eg if you calculated the C-C BE in cyclobutane the value would be lower than the standard value because the bonds in cyclobutane are strained – pulled in to 90 degrees to each other.