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Average Atomic Mass Chemistry
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Judith Simpson
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Steven Ramirez
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What are three things other than name, symbol, atomic number, and average atomic mass, that you can discover from a periodic table.
Its electrons in each energy level, (Solid, gas, liquid) at room temp, Which group of elements it is in.
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Show the formula for finding the average atomic mass.
(Percentage1 x amu1) + (Percentage2 x amu2)100
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What’s average atomic mass?
Weighted average of all of an atoms isotopes
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How does atomic mass differ from average atomic mass
atomic mass is the sum of the number of protons and neutrons in the atom. Average atomic mass is a weighted average taking in account the percent abundance of each isotope and each isotopes individual mass
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Calculating Average Atomic MassExample:Carbon 12: 98.9%Carbon 14: 1.1%
98.9% * 12 / 100 = 11.8681.1% * 14 / 100 = .154 11.868 + .154 = 12.022 Average Atomic Mass = 12.022amu
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Silver has two naturally occuring isotopes with the following isotopic masses:107/47 Ag- 106.90509, 107/47 Ag- 108.9047The average atomic mass of silver is 107.8682amu. The fractional abundance of the lighter of the two isotopes is _.a) .90474, b) .24221, c) .51835, d) .48168, e) .75783
106.90509(X) 108.9047(1-X)108.9-108.9(x)+106.9(x) = 107.87-2x-1.03 c) .51835
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What is the formula for average atomic mass
(Mass)(%)/100 or (mass)(decimal)
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