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Textbook Expert
Textbook ExpertVerified Tutor
23 Oct 2021

Given information

From Appendix IIB

  

     

Step-by-step explanation

Step 1.

The standard state of carbon is and the standard state of hydrogen is . Therefore, the standard enthalpy of formation of  involves these species as reactants.

The chemical equation for the formation of  is:

  

The given reaction contains one carbon and two hydrogen atoms on the reactant side and two carbon atoms and four hydrogen atoms on the products side.

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