Consider
Class 2
Wednesday, August 25th
.k is in m/s, E in J/mol, T is in
K. What are the units of 8.314?
•  Putting entire equations in new units
•  Linearizing equations
•  Graphing these linear equations
Consider
k is in m/s, E in J/mol, T is in K.
What are the units of 5.4 X 10-3?
a)  Unitless
c) J/mol
Consider
k is in m/s, E in J/mol,
T is in K. We want the new expression in units of ft, Btu, lbmole and R.
Therefore, k =
b) m/s
d) s/m
1
Consider
k is in m/s, E in J/mol,
T is in K. We want the new expression in units of ft, Btu, lbmole and R.
Therefore, E =
a)  4.64 E’ b) 2.32 E’ c) 1.24 E’ d) 6.74 E’
You are given a number of x and y data from an experiment.
You suspect it takes the form: sin(y) = a(x2 - 2)b
Consider
k is in m/s, E in J/mol,
T is in K. We want the expression in units of ft, Btu, lb-mole
and R. Our new equation is: k’(ft/s) = ? where E’ is in Btu/lbmol and T’ is in R.
The rate at which a substance passes through a
semipermeable membrane is determined by
the diffusivity D(cm2/s) of the gas. D varies
with the membrane temperature T(K)
according to the Arrhenius Law:
What are the units of Do?
a)  cm2
c) cm2/s
b) s-1
d) cm/s
2
The rate at which a substance passes through a
semipermeable membrane is determined by
the diffusivity D(cm2/s) of the gas. D varies
with the membrane temperature T(K)
according to the Arrhenius Law:
What is the linear form of the equation?
The rate at which a substance passes through a
semipermeable membrane is determined by the diffusivity
D(cm2/s) of the gas. D varies with the membrane temperature
T(K) according to the Arrhenius Law: D = Do exp(-E/RT)
What is the slope?
a)
b)
c) Do
d) -E
The rate at which a substance passes through a
semipermeable membrane is determined by the diffusivity
D(cm2/s) of the gas. D varies with the membrane temperature
T(K) according to the Arrhenius Law: D = Do exp(-E/RT)
What is the intercept?
The rate at which a substance passes through a
semipermeable membrane is determined by the diffusivity
D(cm2/s) of the gas. D varies with the membrane temperature
T(K) according to the Arrhenius Law: D = Do exp(-E/RT)
What is the dependent variable?
a)  0
b) –E/R (1/T)
c) Do
d) ln Do
a)  D
b) ln D
c) Do
d) ln Do
3
The rate at which a substance passes through a
semipermeable membrane is determined by the diffusivity
D(cm2/s) of the gas. D varies with the membrane temperature
T(K) according to the Arrhenius Law: D = Do exp(-E/RT)
If the slope is –E/R, what is the independent variable?
a)  1/T
b) T
c)-1/T
d) -T
Problem 2.45 (p. 41)
4