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Year 1 - Chem
Equations for test
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Cards (13)
p
a
=
p_a=
p
a
=
x
A
p
A
∗
x_Ap_A*
x
A
p
A
∗
What is Raoults equation?
Σ
(
v
i
Δ
f
H
293
0
(
p
r
o
d
u
c
t
s
)
−
Σ
(
v
i
Δ
f
H
293
0
(
r
e
a
c
t
a
n
t
s
)
=
\Sigma(vi\Delta_fH_{293}^{0}(products)-\Sigma(vi\Delta_fH_{293}^{0}(reactants)=
Σ
(
v
i
Δ
f
H
293
0
(
p
ro
d
u
c
t
s
)
−
Σ
(
v
i
Δ
f
H
293
0
(
re
a
c
t
an
t
s
)
=
Δ
r
H
293
0
\Delta_rH_{293}^{0}
Δ
r
H
293
0
How to calculate
enthalpy change
of a
reaction
?
Δ
r
G
o
=
\Delta _rG^o =
Δ
r
G
o
=
−
R
T
l
n
k
-RTlnk
−
RTl
nk
R=gas constant
T= temperature (kelvin)
K= Thermodyanmic constant
ln= natural log
How to calculate standard
Gibbs energy energy change
p
A
=
p_A =
p
A
=
x
a
K
a
x_aK_a
x
a
K
a
What is Henry's law?
Σ
(
v
i
S
293
0
(
p
r
o
d
u
c
t
s
)
−
Σ
(
v
i
S
293
0
(
r
e
a
c
t
a
n
t
s
)
=
\Sigma(v_iS_{293}^{0}(products)-\Sigma(v_i S_{293}^{0}(reactants)=
Σ
(
v
i
S
293
0
(
p
ro
d
u
c
t
s
)
−
Σ
(
v
i
S
293
0
(
re
a
c
t
an
t
s
)
=
Δ
r
S
293
0
\Delta_rS_{293}^{0}
Δ
r
S
293
0
How to work out
entropy
of a
reaction
?
Δ
G
o
=
\Delta G^o =
Δ
G
o
=
Δ
H
−
T
Δ
S
\Delta H-T\Delta S
Δ
H
−
T
Δ
S
H=
enthalpy
How to calculate Gibbs energy of the system?
Q
=
Q=
Q
=
Π
a
(
p
r
o
d
u
c
t
s
)
V
p
Π
a
(
r
e
a
c
t
a
n
t
s
)
V
r
\frac{\Pi a(products)^Vp}{\Pi a(reactants)^Vr}
Π
a
(
re
a
c
t
an
t
s
)
V
r
Π
a
(
p
ro
d
u
c
t
s
)
V
p
how to calculate reaction quotient
S
T
f
=
S_{Tf}=
S
T
f
=
S
T
i
+
S_{Ti}+
S
T
i
+
C
p
l
n
T
f
T
i
C_pln\frac{T_f}{T_i}
C
p
l
n
T
i
T
f
S=
entropy
Ti= temperature
initial
Tf= temperature
final
How to calculate variation of entropy of a substance?
Δ
T
b
=
\Delta T_b =
Δ
T
b
=
i
K
b
b
A
i K_bb_A
i
K
b
b
A
bA= Molarity = (no. moles of solute A)/kg solvent
Kb= Eulioacopic constant
How to calculate the boiling point increase?
Δ
T
f
=
\Delta T_f=
Δ
T
f
=
i
K
f
b
A
iK_fb_A
i
K
f
b
A
i= stoichiometric number of ions
bA= molarity
Kf= crysocopic constant
How to calculate the
decrease in freezing point
?
Π
V
=
\Pi V=
Π
V
=
i
n
R
T
inRT
in
RT
V=volume
of solvent
n=
number
of
moles
i =
van't Hoff factor
What is the Van't Hoff equation?
Δ
G
=
\Delta G =
Δ
G
=
z
F
E
zFE
z
FE
z=number of electrons in half reactions
F= faraday's constant
How to calculate
Gibbs free energy
?
E
=
E=
E
=
E
o
−
R
T
z
f
l
n
Q
E^o -\frac {RT}{zf}lnQ
E
o
−
z
f
RT
l
n
Q
tell us the potential of a cell
What is the
Nernesr Equation
?
