i deal gas law & r eal gases. i deal g as l aw : used when the amount of gas varies can be used...
Post on 23-Dec-2015
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IDEAL GAS LAW &
REAL GASES
IDEAL GAS LAW:
Used when the amount of gas varies
Can be used to calculate the number of moles of gas
Needed in the equation
R = 8.31 (L x kPa)/ (K x mol)
R = 0.0821 (L x atm)/ (K x mol)
When to use it? Ideal Gas Law Constant
IDEAL GAS LAW EQUATION:
PV = nRT
PRACTICE PROBLEM
When the temp of a rigid hollow sphere containing 685 L of helium gas is held at 621 K, the pressure of the gas is 1.89 x 103 kPa. How many moles of helium does the sphere contain?
REAL GASES
Do not always follow the ideal gas law
Due to the fact that gas particles DO have volume & can be attracted to each other
Differ most at low temps & high pressures
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