Atomic Structure Calculating Average Atomic Mass Average Atomic

Atomic Structure Calculating Average Atomic Mass

Average Atomic Mass Weight underneath each element on the periodic table is an average of all the isotopes that exist for that specific element 1 H 1. 0079 Hydrogen Isotopes of Hydrogen Mass of isotope (Relative Atomic Mass) Percent Abundance (%) Hydrogen – 1 1. 007825 99. 9885 Hydrogen – 2 2. 0141022 0. 0115 Hydrogen – 3 3. 016049 0. 003

Calculating Average Atomic Mass 1. Convert Percentages into DECIMALS These percentages are your percent abundance #’s To do this you need to Divide by 100 2. Multiply the percent abundance DECIMALS by its relative atomic mass 3. Add ALL the numbers from STEP 2 together

1. Convert Percentages into DECIMALS These percentages are your percent abundance #’s (Divide by 100) 2. Multiply the percent abundance DECIMALS by its relative atomic mass 3. Add ALL the numbers from STEP 2 together Naturally occurring copper is 69. 1% Cu-63 and 30. 9% Cu-65. What is the average atomic mass?

1. Convert Percentages into DECIMALS These percentages are your percent abundance #’s (Divide by 100) 2. Multiply the percent abundance DECIMALS by its relative atomic mass 3. Add ALL the numbers from STEP 2 together What is the average atomic mass of a sample of Neon with 90. 0% Neon-20 & 10. 0%Neon-22?

1. Convert Percentages into DECIMALS These percentages are your percent abundance #’s (Divide by 100) 2. Multiply the percent abundance DECIMALS by its relative atomic mass 3. Add ALL the numbers from STEP 2 together Calculate the average atomic weight for carbon from the following isotopic information: 98. 892% Carbon-12 and 1. 108% Carbon-13