Chemistry Chapter 3 Section 3

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Presentation transcript:

Chemistry Chapter 3 Section 3 Counting Atoms: Average Atomic Mass

Average Atomic Mass Elements are usually mixtures of isotopes Average atomic mass is weighted average of naturally occurring isotopes of an element Calculated by taking percent of that isotope times mass of that isotope

Calculating Average Atomic Mass Example Copper Average atomic mass: (0.6917)(62.929598) + (0.3083)(64.927793) 63.55 amu Isotope Percent Mass (amu) Copper-63 69.17% 62.929 598 Copper-65 30.83% 64.927 793

Your task: Using the values given in Table 3-4 (p 80), calculate the average atomic mass of: Hydrogen Carbon Oxygen Show all your work and turn this in!