Physical Chemistry for Health Professionals CHEM 4600-Practice Quiz #I 3/2/2017

Question

Physical Chemistry for Health Professionals CHEM 4600-Practice Quiz #I 3/2/2017 NAME The graph on the right shows the chemical potential oftwo pure gases. A and B, as a function of temperature at the standard pressure of 1 bar. (a) Circle the correct statement The standard molar entropies ofA and B are equal to each other at u u m................ temperature T entropy of substance B at temperatures below T1 The standard molar entropy of substance A is greater than the molar entropy of substance B at temperatures above TI py of substance A is greater than the molar entropy of substance B at all temperatures indicated all (i) standard molar entropy of substance Ais smaller than the molar entropy of substance B at temperatures indicated (b) Gases A and B are mixed and a small amount of catalyst is added to allow the chemical reaction: A B Circle the statement or statements which are certainly correct assume gases A and B are ideal gases) (i) At temperature T the standard molar Gibbs free energy of the reaction is zero GiAttemperature T1 the reaction is at equilibrium when the partial pressures of A and Bare both l bar (iii) At temperature T2 the standard molar Gibbs free energy of the reaction is positive (iv)At temperature T2 the standard molar Gibbs free energy of the reaction is negative

Explanation / Answer

(a)...the standerd molar entropies of A and B are equal to each other at temprature T

explanation... because the chemical potential of both the gases are same and at same chemical potential molar entropies of two gases are same

(b)..at temprature T the standerd molar gibbs free energy of the reaction is zero..

explanation....because at equilibirum gibbs free energy is zero

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