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Using Isotope Data to Find a Weighted Average.  Each isotope will have two values associated with it.  Mass of Isotope  Percent Abundance (% found.

Published byClifford Simpson Modified over 8 years ago

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Presentation on theme: "Using Isotope Data to Find a Weighted Average.  Each isotope will have two values associated with it.  Mass of Isotope  Percent Abundance (% found."— Presentation transcript:

1 Using Isotope Data to Find a Weighted Average

2  Each isotope will have two values associated with it.  Mass of Isotope  Percent Abundance (% found in nature)  Units for Atomic Mass:  AMU = atomic mass unit  Weighted average

3  Step #1: For each isotope: (contributing mass) Mass of isotope X (% abundance/100)  Step #2: Add products from Step #1

4 Carbon has two naturally occurring isotopes. Carbon-12 has a mass of 12.000-amu with an abundance of 98.890%. Carbon-13 has a mass of 13.003-amu with an abundance of 1.11%. Calculate the average atomic mass of carbon.

5 Isotope% AbundanceMass (amu) Oxygen-1699.75915.995 Oxygen-170.0416.115 Oxygen-180.2117.999

6 Calculate the average atomic mass of copper using the isotope data in the above table. Isotope% AbundanceMass (amu) Copper-6369.2062.93 Copper-6530.8064.93

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