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3
Manometers
Manometers
A manometer can be used to measure the gas pressure
for a sample of gas
Key point
: pressure is the same for a given height in the liquid region
From elementary physics:
Gravitational force applied by
a body = mg = d (Ah) g
Where
d = density
A = surface area of liquid
H = height of liquid
g = gravitational constant
gas
atm
h
P
P
+
=
gas
atm
P
P
h
=
+
4
From: Quiz 1, Chem 122 Winter 08, Dr. Mathews
5
The Ideal Gas Law – A Closer
Look
nRT
pV
=
Constant
n
constant
PV
T
=
General gas equation
Use for cases where we
have the same
sample of
gas present
P
T
∝
Constant V
Charles’ Law
Constant V, T
P
n
∝
Avogadro’s Law
Constant T
1
P
V
∝
Boyle’s Law
n=1 at STP
1 mol = 22.4 L
6
Using the Ideal Gas Law
•
Learn and know how to use this equation!
– Use correct units and correct value of
R
.
• Know which pressure units you are using – be able to
interconvert between them.
– Conversion factors are on the data sheet.
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This note was uploaded on 04/29/2008 for the course CHEM 122 taught by Professor Zellmer during the Winter '07 term at Ohio State.
 Winter '07
 Zellmer
 pH

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