Write a separate, balanced chemical equation for the combustion of each of the f

Question

Write a separate, balanced chemical equation for the combustion of each of the following: C(s), H2(g) , and CaHsOH(l) . Consider the only products to be CO2(g) and/or H2O(1) . In principle, etharol can be prepared by the following reaction. 2 C(s) + 2 H2(g) + H2O(l) --> C2H5OH(1) Calculate the standard enthalpy change, Hdegree, for the preparation of ethanol, as shown in the reaction above. Calculate the standard entropy change, Sdegree, for the reaction given in part (b) Calculate the value of the equilibrium constant at 25degreeC for the reaction represented by the equation in part {b}.

Explanation / Answer

We Know that :       The combustion reaction can bewritten as:            C(s) + O2 (g) ------> CO2(g)             2 H2 (g) + O2 (g) --------> 2H2O (l)              C2H5OH (l) + 3O2(g) ---------> 2 CO2 (g) + 3 H2O (g)                   2 C (s) + 2H2 (g) + H2O (l) --------> C2H5OH (l)           H reaction = H products - H reactants                                  = -277.7 - [ -285.8 ] kJ                                  = + 8.1 kJ           Sreaction =   S products - S reactants                              = 160.7 - [ 2 * 5.740 + 2 * 130.6 + 69.91 ]                              = -170.41 J/K         

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