Investigate whether the replacement of a carbon–carbon double bond by single bonds is energetically favored by using Tables 4E.2 and 4E.3 to calculate the reaction enthalpy for the conversion of ethene, C₂H₄, to ethane, C₂H₆. The reaction is

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H₂C=CH₂(g) + H₂(g) →CH3-CH3(g).