Thermo 's Example :
• check units !!
entropy :[JIK] chaos s universe =
system + Dsurr =
0
•
state functions = 5
,
H , G
specific entropy 5 =
• →
J.lk any temp
• molar entropy → J / molik 5° =
standard tempt pressure STP
SF =
entropy of formation :
energy needed
to form
-
solid liquid gas
Sf = standard of formation
logion ; 05
Sis ) 7 Sa ) 75cg ) ok =
no entropy
2h20 (g)
+
02 (g) → 2h20
3 : 2 Gren = H =
Sys
↑ temp
temp
chaos more
Reversible
condensation
•
equilibrium phase change
:
vapourisatioh going to reach equi . Surr =
-
Sys .
boiling
melting
•
t -
constant [ constant temp ] freezing
# =
H product -
☐ Hreac .
£
(adding]
heat
[
removing
heat -_
negative ] e)
☐ St solid liquid solid
gas liquid
- =
=
,
0s gas / ,
u - u -
Irreversible
[spontaneous]
☐ Sain =
Ssys + ☐ Ssurr TO
ssys
=
En products -
En reactants
-0¥
05¥
Entropy less 0
=
not
spontaneous
= 0 reversible
7 0 spontaneous
Entropy
• check units !!
entropy :[JIK] chaos s universe =
system + Dsurr =
0
•
state functions = 5
,
H , G
specific entropy 5 =
• →
J.lk any temp
• molar entropy → J / molik 5° =
standard tempt pressure STP
SF =
entropy of formation :
energy needed
to form
-
solid liquid gas
Sf = standard of formation
logion ; 05
Sis ) 7 Sa ) 75cg ) ok =
no entropy
2h20 (g)
+
02 (g) → 2h20
3 : 2 Gren = H =
Sys
↑ temp
temp
chaos more
Reversible
condensation
•
equilibrium phase change
:
vapourisatioh going to reach equi . Surr =
-
Sys .
boiling
melting
•
t -
constant [ constant temp ] freezing
# =
H product -
☐ Hreac .
£
(adding]
heat
[
removing
heat -_
negative ] e)
☐ St solid liquid solid
gas liquid
- =
=
,
0s gas / ,
u - u -
Irreversible
[spontaneous]
☐ Sain =
Ssys + ☐ Ssurr TO
ssys
=
En products -
En reactants
-0¥
05¥
Entropy less 0
=
not
spontaneous
= 0 reversible
7 0 spontaneous
Entropy
