9. Using the standard enthalpies of formation and isobaric heat capacities in Table. 11.4 (Appendix 11) calculate the standard enthalpy at 298 K and 398 K of the reaction indicated in the table below. Also determine how much the standard internal energy ∆U° of this reaction differs from ∆Н°.
4HСl (g) O2 (g)= 2H2O (l) 2Cl2 (g)

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