SABIC CHEM 101 Chapter 5 - Part 4

# SABIC CHEM 101 Chapter 5 - Part 4 - be calculated Molar...

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Standard Condi+ons The molar volume of a gas at a given temperature and pressure will be a constant value that is independent upon the identity of the gas itself. These standard conditions are: T = 0 o C (273.2 K) P = 1 atm And are called STP ( ) For 1 mole of an ideal gas at 0°C and 1 atm, the volume of the gas is 22.42 L.

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W Standard Condi+ons We can also find relate the mass of a mole of gas to volume at STP:
Using STP Data We do not need to use the Ideal Gas Law (although we could). We can simply use the relationship between moles and volume for a gas at STP: What is the mass of this gas?

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Example A sample of oxygen gas has a volume of 2.50 L at STP. How many grams of O 2 are present?
Example

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Finding Molar Mass of a Gas If the density of a gas at a given temperature and pressure is known, its molar mass can

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Unformatted text preview: be calculated Molar mass = grams/mole = MW We need to work MW into the ideal gas law! Substitution into the ideal gas law gives: Finding Molar Mass of a Gas If the density of a gas at a given temperature and pressure is known, its molar mass can be calculated Molar mass = grams/mole = MW We need to work MW into the ideal gas law! Worked Example Example What is the density of F 2 at STP (in g/L)? Gas S+ochiometry Many chemical reactions involve gases. By assuming ideal behavior for these gases we can carry out stoichiometric calculations if the pressure, volume and temperature are known This is the same as what we have seen so far except now one of the reagents/products is a gas Worked Example Worked Example Example Your Turn Your Turn Homework Read Chapter 5 pages 194-1199. Do problems: 64, 67, 69...
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## This note was uploaded on 10/13/2011 for the course CHEM 101 taught by Professor Fitts during the Fall '08 term at UPenn.

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SABIC CHEM 101 Chapter 5 - Part 4 - be calculated Molar...

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