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Unformatted text preview: Chem 16 Significant figures I. Examples 1. 0.001 – 1 sig fig 2. 0.050 – 2 sig figs 3. 0.100 – 3 sig figs 4. 2.000 – 4 sig figs 5. 5000 – 1 sig fig 6. 500.0 – 4 sig figs 7. 4010 – 3 sig figs 8. 3500 – 2 sig figs 9. 6.022 X 10 23 – 4 sig figs II. Exact numbers  have an infinite number of significant figures Example: 1 dozen = 12 pieces  conversion factors have infinite number of significant figures Example: 1 kilogram = 2.205 pounds III. Significant figures in calculations  Multiplication and division : significant figures are determined by the quantity with the least number of significant figures Examples: 1. 63.2 X 54 X 2.000 = 6825.6 6800 2. (5460 X 2877)/460 = 34148.73913 34000 3. A dozen of pencils costs P 38.76. How much will 3 dozens cost? Answer: 38.76 X 3 = 116.28 116.3 not 100 because 3 is an exact number and has an infinite number of significant figures. As a consequence, 38.76 has the least number of significant figures thus the final answer should have the same number of significant figures. significant figures thus the final answer should have the same number of significant figures....
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This note was uploaded on 08/31/2010 for the course IC 10 taught by Professor Mapas during the Spring '10 term at University of the Philippines Diliman.
 Spring '10
 Mapas

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