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# Lecture10222

## by Uladzimir Slabin, faculty at University of Oregon on Jul 30, 2008

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a supplemental resource for students

a supplemental resource for students

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## Lecture10222Presentation Transcript

• Gas State: Ideal Gas Law Lecture 10
• Standard temperature and pressure (STP):
• 273.15K (0  C or 32  F)
• 101325 Pa (1 atm or 760 torr)
• Under STP the volume of 1 mol of an ideal gas is called the standard molar volume:
• 22.4141 L or 22.4 L (or dm 3 )
• One mol of gas in different conditions
• Gas laws’ emphases:
• Boyle’s law focuses on pressure;
• Charles’s law focuses on temperature;
• Avogadro’s law focuses on amount of gas,
• and all the above listed laws connect the above mentioned effects to the gas volume. Let us combine:
• PV=nRT
• Universal gas constant PV=nRT R=PV/nT R=(1atm x 22.4141L) /( 1mol x 273.15K)= = 0.0821 (atm x L)/(mol x K)
• Universal gas constant PV=nRT R=PV/nT R=(101325Pa x 0.0224141m 3 ) /( 1mol x 273.15K)= = 8.314 J/(mol x K)
• The ideal gas law becomes one of the individual gas laws when two of the four variables are kept constant.
• Typology of gas law problems:
• A change in one of the four variables causes a change in another, while the two remaining variables remain constant.
• One variable is unknown, but the other three are known and no change occurs.
• A sample problem on finding an unknown gas variable at fixed conditions.
• A sample problem on using gas laws to determine a balanced equation.
•
• THE END