Summary Thermodynamics

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