Consider the entropy of the initial and final states during chemical changes. Fo
ID: 557116 • Letter: C
Question
Consider the entropy of the initial and final states during chemical changes. For each reaction, answer each of the following three questions. Note: the sign for the enthalpy (heat) of reaction is given for each change to help you Which state is more likely from a thermal entropy standpoint, the reactants or products? Explain why in terms of energy probability (dispersal of energy. Which state is more likely from a structural entropy standpoint, the reactants or products? Explain why in terms of structure probability (dispersal of particles) Based on your answers to parts a. and b., would you expect to observe the reaction to favor the reactants or the products (as written)? Explain. a. b. c. 6. 7. Reaction: Reaction: 4 NO(g) + 6 H2O(l) 4 NHs (g) + 5 O2(g) CaC; (s) + 2 H2O(l) Ca(OH)2(s) + Chh(g) ,u" = (Explanation / Answer
a) Reaction 1 is endothermic, i.e heat is added to the system (reactants) while reaction 2 is exothermic where is released by the system. Now, thermal entropy is dependent on temperature; higher the temperature greater will be the thermal entropy. Therefore, reactants are more likely for reaction 1 while products will be favored for reaction 2.
b) Structural entropy is the randomness associated with molecular orientation. Entropy increases from solid to liquid to gas. In reaction 1 the product are more likely as both are in the gaseous state. Again, products will be favored in reaction 2 as well because one of them is a gas in contrast to the reactant which is in the liquid phase.
c) For reaction 2) both thermal and structural entropy favor the products
It is hard to comment for reaction 1) as thermal favors the reactants while stuctural entropy favors the products