factor-label-method

# factor-label-method - Thefactorlabelmethod T...

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A way to solve math problems in chemistry Used to convert km to miles, m to km, mol to g, g to mol, etc. To use this we need: 1) desired quantity, 2) given quantity, 3) conversion factors Conversion factors are valid relationships or equities expressed as a fraction E.g. for 1 km=0.6 miles the conversion factor is The factor label method The factor label method km 1 miles 0.6 or miles 0.6 km 1 Q. write conversion factors for 1 foot =12 inches Q. what conversion factors can you think of that involve meters?

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Conversion factors Conversion factors Conversion factors for 1 ft = 12 in foot 1 inches 12 or inches 12 foot 1 There are almost an infinite number of conversion factors that include meters: mm 1000 m 1 , cm 100 m 1 , km 1 m 1000 m 1 yards 0.9144 , inches 39.37 m 1 , feet 3.28 m 1
Conversion factors Conversion factors We have looked at conversion factors that are always true. There are conversion factors that are only true for specific questions E.g. A recipe calls for 2 eggs, 1 cup of flour and 0.5 cups of sugar We can use these conversion factors sugar cups 0.5 eggs 2 , flour cup 1 sugar cups 0.5 , flour cup 1 eggs 2 • Q - the chemical equation between H 2 and O 2 involves 2 H 2 molecules combining with 1 O 2 molecule to make 2 H 2 O molecules. Write all possible conversion factors

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2 molecules H 2 1 molecule O 2 1 molecule O 2 2 molecules H 2 2 molecules H 2 2 molecules H 2 O 2 molecules H 2 O 2 molecules H 2 1 molecule O 2 2 molecules H 2 O 2 molecules H 2 O 1 molecule O 2 2 mol H 2 1 mol O 2 1 mol O 2 2 mol H 2 2 mol H 2 2 mol H 2 O 2 mol H 2 O 2 mol H 2 1 mol O 2 2 mol H 2 O 2 mol H 2 O 1 mol O 2 2H 2 + O 2 2H 2 O
The steps to follow The steps to follow Now we are ready to solve problems using the factor label method. The steps involved are: 1. Write down the desired quantity/units 2. Equate the desired quantity to given quantity 3. Determine what conversion factors you can use (both universal and question specific)

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## This note was uploaded on 11/09/2011 for the course CHEM 110 taught by Professor Sullivan during the Fall '10 term at BYU.

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factor-label-method - Thefactorlabelmethod T...

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