Combined Gas Law At times 1 and 2 so

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The Ideal Gas Law.

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Presentation transcript:

Combined Gas Law At times 1 and 2 so Generally we worked with closed or sealed systems so n1= n2 The number of moles stays the same.

A sample of 23.0 L of NH3 gas at 10 ºC is heated at a constant pressure until it fills a volume of 50.0 L. What is the new temperature in oC? Note that constant pressure means that P1= P2

How do I know which equation to use? If you see “changing”, “moved”, “compressed”, use the combined gas law equation. If you are asked about a single situation, use the ideal gas equation. PV = nRT

Determining absolute zero

Partial Pressure Defined The partial pressure of a single gas in a mixture is defined as the pressure the gas would exert if it were alone in the container. PV=nRT holds for each individual gas in a mixture, as well as for the total mixture.

An example

Air Air 100% 1.00 atm Nitrogen (N2) 78% 0.78 atm Oxygen (O2) 21% (partial pressure of N2) Oxygen (O2) 21% 0.21 atm (partial pressure of O2) Other stuff 1% 0.01 atm