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!