i deal gas law & r eal gases. i deal g as l aw : used when the amount of gas varies can be used...
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IDEAL GAS LAW &
REAL GASES
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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
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IDEAL GAS LAW EQUATION:
PV = nRT
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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?
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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