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calculate the delta h for the reaction 2C+2H--> C2H4

C+O2--> Co2 delta h= -393.5
C2H4+ 3O2--> 2CO2+ 2H2O delta h= 1410.9
H2+ 1/2 O2--> H2O delta h= -285.8
2CO+ O2--> 2CO2 delta h= -566.0

do you flip the first two equations and times the first and third one by 2?

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