Problem: Ethylene, C2H2, a byproduct from the fractional distillation of petroleum, is fourth among the 50 chemical compounds produced commercially in the largest quantities. About 80% of synthetic ethanol is manufactured from ethylene by its reaction with water in the presence of a suitable catalyst. C2H4(g) + H2O(g) ⟶ C2H5OH(l) Using the data in the table in Appendix G, calculate ΔH° for the reaction.

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FREE Expert Solution
  • Setup the ΔH°rxn equation by gathering the ΔH°s of each molecule in the reaction below:

C2H4(g) + H2O(g) ⟶ C2H5OH(l)

  • ΔH°rxn can be solved by getting the difference of ΣΔHproducts and ΣΔHreactions. Equation will appear as

  • The  ΔH° of each molecules are:

ΔH°C2H5OH = -227.7 kJ/mol

ΔH°C2H4 = +52.4 kJ/mol 

ΔH°H2O = -241.82 kJ/mol

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Problem Details

Ethylene, C2H2, a byproduct from the fractional distillation of petroleum, is fourth among the 50 chemical compounds produced commercially in the largest quantities. About 80% of synthetic ethanol is manufactured from ethylene by its reaction with water in the presence of a suitable catalyst. C2H4(g) + H2O(g) ⟶ C2H5OH(l) 

Using the data in the table in Appendix G, calculate ΔH° for the reaction.