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Unformatted text preview: GENERAL CHEMISTRY CHAPTER 5 – GASES PAGE 9 OF 23 The Ideal Gas Law → The relationships we have learned so far can be combined into a single gas law that encompasses all of them: Boyle’s Law = V α 1 P Charles ’ Law = V α T Avogadro’s Law = V α n → Combining these (3) expressions, we get: V α nT P → We can replace the proportionality sign with an equals sing by incorporating R = a proportionality constant = ideal gas constant V = nRT P ; rearranging the equation PV = nRT Ideal Gas Law; R = 0.08206 atm . L mol . K Limitations to the Ideal Gas Law → The ideal gas law is an equation of state for a gas, where the state of the gas is its condition at a given time A particular “state” of gas is described by its pressure, volume, temperature, and no. of moles Knowing any (3) of these properties is enough to define the state of a gas → The ideal gas law is an equation based on experiments → A gas that obeys the equation is said to behave “ideally” It is a limited law it expresses behavior that real gases approach at low pressures at high temperatures → We can say an “ideal gas” is a hypothetical substance But, since most gases obey the ideal equation close enough below pressure at 1 atm, with minimal error, we can use the law Example : How many moles of gas (air) are in the lungs of an average adult with a lung capacity of 3.8-L? How many moles of gas (air) are in the lungs of an average adult with a lung capacity of 3....
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This note was uploaded on 01/21/2011 for the course PHYS 4A 60865 taught by Professor L. oldewurtel during the Fall '09 term at Irvine Valley College.
- Fall '09
- L. OLDEWURTEL