What is #DeltaH_"enthalpy of formation of ethylene"^@#?

1 Answer
anor277
Nov 1, 2017

You measure #DeltaH_"rxn"^@# here....for the formation of acetylene from its elements.

Explanation:

And for....#2C(s) + H_2(g)rarrHC-=CH(g)#, #DeltaH^@# has already been extensively measured.

The reaction specifies standard conditions for the formation of acetylene, i.e. #DeltaH_"rxn"^@=DeltaH_"enthalpy of formation of acetylene"^@#....

....which this site quotes as...#DeltaH_f^@=+226.9*kJ*mol^-1#

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