Answer to Question #65823 in Physical Chemistry for umar

Question

Question 7 : Thermodynamics can be used to determine all of the following EXCEPT
the extent to which a reaction occurs.
the direction in which a reaction is spontaneous.
the temperature at which a reaction is spontaneous.
the rate of reaction.

Question 8 : Calculate the standard entropy change for the following reaction, [Math Processing Error]
2Ag2O(s)→4Ag(s)+O2(g)
; given [Math Processing Error]
So[Ag2O]
= 121.3 J/K·mol, [Math Processing Error]
So
[Ag(s)] = 42.6 J/K·mol, and [Math Processing Error]
So[O2(g)]
= 205.1 J/K·mol.
+126.4 J/K
-126.4 J/K
+132.9 J/K
-205.1 J/K

Answer 1

Answer :
Q7. Thermodynamics can be used to determine all of the following EXCEPT the rate of reaction.
Q8. The standard entropy for the reaction is the difference between standard entropy of the products and reactants taking into account stoichiometric coefficients :
∆S_r=S_0 (O_2 (g))+4∙S_0 (Ag(s))- 2∙S_0 (Ag_2 O(s))
∆S_r=205.1+4∙42.6-2∙121.3
∆S_r=132.9 J/K∙mol