Answer to Question #65773 in Physical Chemistry for muhd

Question

1 : Calculate the standard entropy change for the following reaction,
2
A
g
2
O
(
s
)
→
4
A
g
(
s
)
+
O
2
(
g
)
2Ag2O(s)→4Ag(s)+O2(g); given
S
o
[
A
g
2
O
]
So[Ag2O] = 121.3 J/K·mol,
S
o
So[Ag(s)] = 42.6 J/K·mol, and
S
o
[
O
2
(
g
)
]
So[O2(g)] = 205.1 J/K·mol.
-126.4 J/K
+126.4 J/K
-205.1 J/K
+132.9 J/K
Question 2 : A statement of the second law of thermodynamics is that
the enthalpy of reaction is the difference between product and reactant enthalpies.
energy is conserved in a chemical reaction.
spontaneous reactions are always exothermic.
the entropy of the universe is continually increasing.