# Lecture10222

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Published on July 30, 2008

Source: slideshare.net

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a supplemental resource for students

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 )

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

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 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.

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a supplemental resource for students ... 1. Gas State: Ideal Gas Law Lecture 10