Average Atomic Mass

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7 Terms

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a

abundance

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m

mass of the isotope

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Equation to Calculate

a1 x m1 +a2 x m2 + a3 x m3 +a4 x m4 + a5 x m5… / 100 =

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Why is the atomic mass of nitrogen 14.0067 and not 14?

B/c there are multiple types of Isotopes, not just one

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Ex: 80% ¹²⁷I, 17% ¹²⁶l, 3% ¹²⁸l

(80 × 172) + (17 × 17.126) + (3 × 128) / 100 = 126.86 amu

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Ex: 99% ¹H, 0.8% ²H, 0.2% ³H

(99 × 1) + (.8 × 2) + (.2 × 3) / 100 = 1.012 amu

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Ex: Silver has two isotopes ¹⁰⁷47Ag has a mass of 106.905 amu (52.00%), and 10947 Ag has a mass of 108.905 (48.00%).

52 × 106.905 + 48 × 108.905 / 100 = 107.87 amu