Determining Average Atomic Mass
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1 Chemistry Date: Name: Lab Table: 03.03c Determining Average Atomic Mass Lab Partner(s): Background Determining the average mass of an element uses the same method as determining the weighted average of your grade. For example: Category Percentage of Total Score Contribution to Total Grade (%/100) Contribution Tests Labs Quizzes Homework TOTAL SCORE: 82.5 Notice that although the percentage of each category is an integer, the total score has a decimal. Definition: The mass of an individual atom is measured in atomic mass units. By definition, 1 u is one-twelfth the mass of an unbound neutral atom of a carbon-12 atom. On the periodic table, the atomic mass for each element is the average atomic mass for all of the isotopes of that element. Task Although the mass of any individual atom is an integer, the atomic masses on a periodic table have decimals. For example, the atomic mass of a chlorine atom is u. Your task is to simulate how one calculates the average atomic mass, and to determine the average atomic mass of elements, and the relative abundance or mass of an individual isotope. Model Determining Average Atomic Mass for Copper. (A) Atomic Mass (B) (C) (B*C=D) Copper Copper Average Atomic Mass (sum of relative contributions): Check: The average atomic mass on the class periodic table is F:\ \330_ModChem\330_sections\330_03_Atoms_Hx\ c_Average_Atomic_Mass.docx (9/26/2014)
2 Chemistry Determining Average Atomic Mass p. 2 Procedure 1. Determination of Average Atomic Mass A. Count of the number of each atom of each isotope. (E.g., for a 0.5 of A, count out 50 A and measure the average mass for all 50 atoms. Atomic Mass (for one atom ) (A) (B) (C = A * B) A B C Average Atomic Mass: Calculate the average atomic masses for the following elements. Check your answer with a periodic table. B. Magnesium (symbol _Mg ) Atomic Mass Mg Mg-25 Mg Average Atomic Mass: (Check: Periodic Table: amu)
3 Chemistry Determining Average Atomic Mass p. 3 C. Molybdenum (symbol _Mo ) Atomic Mass Mo Mo Mo Mo Mo Mo Mo Average Atomic Mass: (Check: Periodic Table amu) D. Tin (symbol _Sn_) Mass Number Atomic Mass Average Atomic Mass: (Check: Periodic Table amu)
4 Chemistry 2. Determining s and Atomic Mass Units of Individual s. A. Calculate the atomic mass for gallium-71. Atomic Mass Gallium Gallium-71 (c) / = (a) = (b) = Total Average Atomic Mass: Show all work. (a) Calculate relative abundance by subtracting the known relative abundance from 1 (total relative abundance) (b) Ga-71 contribution = total (69.723) Ga-69 ( ) (c) Calculate Ga-71 atomic mass. B. The two of the three isotopes of silicon have atomic masses and percent abundances of amu ( %) and amu (4.6832%) What is the percentage abundance and atomic mass for silicon-30? (Show all work.) Atomic Mass (%) Silicon Silicon Silicon From Periodic Table, Average atomic mass: (a) is given, so in order to find Atomic Mass, need to know the Average Atomic Mass. Look it up on a periodic table (28.09 g/mol). (b) The sum of the s = 28.09; so solve for Si-30 Contribution. (c) Determine Atomic Mass for Si-30: (Atomic Mass) * ( ) =. Rearrange : Atomic Mass = ( contribution) / ( ) F:\ \330_ModChem\330_sections\330_03_Atoms_Hx\ c_Average_Atomic_Mass.docx (9/26/2014)
5 Chemistry Determining Average Atomic Mass p Extension Antimony has two naturally occurring isotopes. The mass of antimony-121 is amu and the mass of antimony-123 is amu. Using the average atomic mass from the periodic table, find the abundance of each isotope. Show all work.
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