CHE 205
Units and
Linearization
MW and SG
Pressure and
Manometers
Flowcharts and
DOF
Balances
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What are the units of the
constant in the following
equation:
b = 0.08664 R * T / P
where
b(L/mol), P(atm),
R(L*atm/mol*K)
T(K),
What is the linearized form
of the following equation?
(y+2)2 = (sin x / nx)2 + b
What type of relationship is the
following equation and which
axes would be necessary in
order for the plot of C vs. R to be
a straight line?
C=
b
m*R
If an exponential curve fits the
points (2.3, 20) and (7.6, 476),
what are the slope and
intercept of the semi-log plot?
What are the slope and intercept
(with units) of the following
power law relationship:
P(atm) =
b
a*x(N)
What is the definition of molecular
weight?
What is the definition of specific
gravity?
If an object sinks in a container of
water, what can you say about its
density and specific gravity?
What is the average molecular weight
of a equimolar mixture of benzene,
toluene, and xylene?
What is the average molecular
weight of a mixture with 20 wt%
ethane, 35 wt% butane, 15 wt%
hexane, and the rest octane?
If an open tank has 30 ft of water
standing in it, what is the gauge
pressure (in atm) at the bottom of
the tank?
If an open tank has 25 in of
mercury standing in it, what is the
absolute pressure (in bar) at the
bottom of the tank?
What is the gauge pressure in a
closed tank if the absolute
pressure is 12.5 psi?
What is the height of a liquid (SG
= 0.92) in an open tank if the gauge
pressure at the bottom of the tank
is 225 kPa?
What is the pressure at the top of a
closed tank if it contains a liquid
at a height of 28 m (SG = 0.92) and
the gauge pressure at the bottom
of the tank is 225 kPa?
What is missing from the
following flowchart?
100 kg
0.3 kg A/kg
x1 kg A/kg
0.7 kg B/kg
x2 kg B/kg
m1 (kg)
0.2 kg B/kg
0.8 kg C/kg
Complete the following flowchart
using only variables (do not solve)
50 kg A/s
0.6 kg A/kg
0.4 kg B/kg
75 kg /s
0.4 kg B/kg
0.7 kg A/kg
0.6 kg C/kg
0.3 kg B/kg
0.2 kg A/kg
0.8 kg C/kg
Determine the number of
Degrees of Freedom in the
following system
35 lbm
m1 (lbm)
x1 lbm A/lbm
0.45 lbm A/lbm
(1-x1) lbm B/lbm
0.55 lbm B/lbm
20 lbm
0.85 lbm A/lbm
0.15 lbm B/lbm
Determine the number of Degrees of
Freedom in the overall system
m1 kg /s
50 kg A/s
x1 kg A/kg
(1-x1) kg B/kg
m3 kg /s
mo kg /s
0.4 kg B/kg
0.6 kg C/kg
0.7 kg A/kg
m2 kg /s
0.3 kg B/kg
x2 kg A/kg
x3 kg B/kg
(1-x2-x3) kg C/kg
m4 kg /s
0.2 kg A/kg
0.8 kg C/kg
What is the number of Degrees of
Freedom in the first separator for the
following system?
5000 g
m1 (g)
0.25 g A/g
0.60 g A/g
x1 g A/g
0.35 g B/g
0.25 g B/g
(1-x1) g B/g
0.40 g C/g
0.15 g C/g
m2 (g)
m3 (g)
m4 (g)
x2 g A/g
(1-x2) g B/g
3500 g
0.45 g B/g
x3 g A/g
0.55 g C/g
(1-x3) g B/g
How many balances are
independent in the following
system?
100 kg
m2 (kg)
0.3 kg A/kg
x1 kg A/kg
0.7 kg B/kg
x2 kg B/kg
(1-x1-x2) kg C/kg
m1 (kg)
0.2 kg B/kg
0.8 kg C/kg
Please write the balance on B in
the following system:
100 kg
m2 (kg)
0.3 kg A/kg
x1 kg A/kg
0.7 kg B/kg
x2 kg B/kg
(1-x1-x2) kg C/kg
m1 (kg)
0.2 kg B/kg
0.8 kg C/kg
What is the mathematical
expression that represents the
following statement: the feed ratio
of A to B is 2:1?
m1 (kg)
mA (kg)
x1 kg A/kg
(1-x1) kg B/kg
mB (kg)
Write the mathematical expression
that represents the statement – 70% of
the water is stripped from the feed
solution and sent to a processing plant
m2 (kg)
mo (kg)
x1 kg A/kg
x2 kg A/kg
(1-x1) kg H2O/kg
(1-x2) kg H2O/kg
m1 (kg H2O)
To processing
plant
What is the total molar amount of the
overhead product (mO) if 93% of A
is recovered in this stream?
200 mol
mO (mol)
0.5 mol A/mol
0.95 mol A/mol
0.5 mol B/mol
0.05 mol B/mol
mB (mol)
x1 mol A/mol
(1-x1) mol B/mol