A_-_102_F11_Notes

Compositionofcompounds calculatingpercentcomposition

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Unformatted text preview: of
atoms.
 E)
The
molecular
formula
is
the
listing
of
the
atoms
in
an
actual
molecule.

 ChE102
Fall
2011
Class
Notes
‐
Introduction
 A ‐3 
 Unit
Conversions
 Mass
 • Metric
units

kg
 • American
Engineering
units

lbm

 Weight
=
mass
x
acceleration
=
force
 • Metric
units:

1
N
=
1
kg
m/s2
 • American
Engineering
units:

1
lbf
=
32.2
lbm
ft/s2
 
 
 Temperature
Conversions
 • To
convert
a
temperature
from
one
scale
to
another,
use
the
following
equations:
 T(K)
=
T(°C)
+
273.15
 T(°R)
=
T(°F)
+
459.67
 T(°F)
=
1.8
T(°C)
+
32
 T(°R)
=
1.8
T
(K)

 
 250
 degrees
Farenheit
 200
 150
 100
 50
 0
 0
 20
 40
 60
 80
 100
 120
 degrees
Celcius
 • 
 
 
 
 
 To
convert
changes
in
temperature,
use
the
following
relationships,
which
give
the
 rate
of
change
per
degree
of
temperature
(aka
slope
of
the
line):
 o o 1C1F , , 1 K 1 oR 1K , 1K o , 1C o , 1C 1.8 o R 1.8 o F 1.8 o F 1.8 o R € ChE102
Fall
2011
Class
Notes
‐
Introduction
 A ‐4 
 Question
A2
 On
a
very
cold
day
in
Alaska,
the
temperature
was
‐40°F.

True
or
false:

the
temperature
 in
degrees
Celsius
on
the
same
day
was
also
‐40.
 
 
 Density
 • Density
is
the
mass
per
unit
volume
(e.g.
g/mL,
____________)
 • Allows
conversion
between
volume
and
mass
of
a
substance
or
solution
 
 
 Question
A3
 1.00
oz
of
gold
(density
=
19.3
g/mL)
canbe
hammered
into
a
sheet
that
would
cover
a
 100
ft2
area.

How
thick
would
such
a
sheet
be
in
centimeters?

 
 
 Percent
Composition
 • Percent
from
the
Lat...
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