Chemistry_Reasoning_Entropy.docx

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Name: _________________________          Period: ______  Date: ____________ Instructor: Dr. J. Campagnolo Homework: Chemistry, 2015-16, Reasoning Entropy and Then Computing it Calculating       S       of the system Absolute molar  entropies at 25 o C for pure substances in their standard states (S o ) are listed in the  large data file on the class website.  (Molar entropy is the amount of entropy contained in 1 mole  of a substance.)  These numbers allow us to calculate the standard entropy change ( S o ) for any  reaction!  Since entropy is a state functions, one can calculate  S o  as follows:  S o  =  total entropy of the products – total entropy of the reactants   S o  =   nS o   (products) -   mS o   (reactants) 1 Predict the sign for  S o  and then calculate  S o  and  H o  from the data below.
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