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

Answer 1

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

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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Answer 2

Henry Antrim

The standard enthalpy of formation of ethylene (C2H4) is approximately ( ΔH_f^θ = +52.3 , \text{kJ/mol} ).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.