4. Calculate the enthalpy of decomposition of a benzene molecule into atoms in the gas phase if the bond energy in an H2 molecule is 436.0 kJ/mol and the heat effects at 25 C of the following reactions are known%
C2H2(g)=2C(g)+H2(g)+226.7 kJ
3C2H2(g)=C6H6(l)+631.1 kJ
C6H6(l)=C6H6(g)+-33.9 kJ

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