88. Solving a chemistry problem

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99. Determine the ΔfH0 of ethylene using the following data:
C2H4(g) 3O2(g) = 2CO2(g) 2H2O(g), ΔH0=-1323 kJ;
C(graphite) O2(g) = CO2(g) ; ΔH0=-393.5 kJ;
H2 (g) 0.5O2 (g) = H2O (g); ΔH0=-241.8 kJ.

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