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Gases 2
Title: Gases 2
Category: Science & Technology
Details: Words: 335 | Pages: 1.4 (approximately 235 words/page)
Gases 2
concreteGases
Properties of gases
Elemental (He) or molecular (co2).
No shape-expands to fill any container
Highly compressible (density function of applied pressure).
Form homogeneous mixtures.
Individual molecules far apart from each other.
Pressure
= force/area
Gases exert pressure on any surface that it comes into contact with.
Units of pressure Nm-2 = Pascal’s
Other units:
Standard atmospheric pressure typically supports 760mm Hg at sea level.
1 atmosphere (atm)
= 760mm Hg (torr)
= 1.015 * 10’5 Pa (pascals)
= 101.3 kPa
Gas Laws
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…showed last 75 words of 335 total…T, ie when no attractive force between molecules.
R = Universal gas Constant
8.3143 JK-1 mol –1 P in kPa, V in L
P in Pa, V in m3
0.0821 L atm K-1 mol-1 P= atm, V in L
units very important.
Gas Density
Rearranging ideal gas equation.
n/V = D/RT
Multiply both sides by Molar Mass (M)
M n/v = g/mol * mol/L = g/L
= density d or p
d = M P/RT M = dRT/P
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