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19 Chemical Thermodynamics Solutions to Exercises In Because the reaction is endothermic, the value of K increases with an increase in temperature. = = at 298 = = K = X at 773 K, = -176.9 = -133.02 = -133.0 = Because this reaction is exothermic, the value of K decreases with increasing temperature. (b) The difference in for the two reactions is primarily enthalpic; the first reaction is endothermic and the second exothermic. Both reactions have which inhibits spontaneity. (c) This is an example of coupling a useful but nonspontaneous reaction with a spontaneous one to spontaneously produce a desired product. 2CH₄(g) C₂H₆(g)+H₂(g) H₂O(g) C₂H₆(g)+H₂O(g) (d) 19.103 for the metabolism of glucose is: 604