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2) C+O2⇒CO2 ΔH= -394
3)2C+H2⇒C2H2 ΔH= 52
⇒ C2H2+5/2O2⇒2CO2+H2O
3) C2H2⇒2C+H2 ΔH= -52
2) 2C+2O2⇒2CO2 ΔH= -788
1) H2+1/2O2⇒H2O ΔH= -242
C2H2+5/2O2⇒2CO2+H2O ΔH= - 1.082