Average Atomic Mass
This collection provides insights into calculating average atomic mass, including definitions, practices, and logic problems related to isotopes and mass spectrometry.
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Drill Take a few minutes to look over your notes for your quiz!!
Agenda Quiz Average Atomic Mass Notes and Practice Candium Lab HW
I Can Calculate the average atomic mass for an element
Average Atomic Mass The weighted average mass of all the isotopes found in nature for that element
Units Average Atomic Mass is measured in atomic mass units (amu)
Mass Spectrometer Instrument that determines the percentages and individual masses of each isotope
Calculations The average atomic mass is calculated by the percent of each isotope s mass: (mass) (%) + (mass) (%) + (mass) (%)
Practice Problem 1 Boron has two isotopes: Boron-10 and Boron-11. In nature 19% of Boron is Boron-10 and 81% is Boron- 11.
Answer (0.19 x 10) + (0.81 x 11) = 10.81 amu
Practice Problem 2 A new element, Tyserium (Ty) has recently been discovered on Mars and consists of two isotopes. One isotope has a mass of 331 amu and is 35.0% abundant. The other isotope is 339 amu and is 65.0% abundant. What is the mass of Ty?
Answer (331 x 0.35) + (339 x 0.65) = 336.2 amu
Logic Problem #1 Copper has an average atomic mass of 63.546 amu and only exists as Copper-63 and Copper-65. What is the isotopic mass of the most common isotope of Copper?
Answer Copper 63 **Average mass is closer to Copper - 63
Logic Problem #2 The relative atomic mass of chlorine is 35.5 amu. What does this tell you about the relative abundance of the two naturally occurring isotopes of chlorine, Chlorine-35 and Chlorine-37.
Answer Chlorine 35 **Answer is closer to Chlorine - 35
Check Yourself! Make sure your calculated average mass is within the range of the given mass numbers Rationalize your results Check your answers on the periodic table
Candium Lab Goal: Find the average atomic mass of Candium
When you are done with the lab Clean up area Come up to the elmo and post average atomic mass Complete analysis questions Start Average Atomic Mass HW
