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fH( ethene )=52.3kJmol1 at 298K. Estimate fH( ethene ) at 500K. Hint: Use the Hess's law (ethene can be formed by burning C(s) with H2(g)

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fH( ethene )=52.3kJmol1 at 298K. Estimate fH( ethene ) at 500K. Hint: Use the Hess's law (ethene can be formed by burning C(s) with H2(g) ) and the Kirchhoff equation. Assume that the heat capacities of all the chemical species involved are independent of temperature, and therefore the heat capacity values at 298K in the Appendix of your lecture outline can be used directly in this case

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