Atomic Weight and Isotopic Abundance

# Atomic Weight and Isotopic Abundance - The atomic weight of...

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1 Atomic Weight and Isotopic Abundance () amu 51.998 amu 1.284 5.056 43.506 2.153 amu) 53.939 0.0238 ( amu) 52.941 (0.0955 amu) 51.941 (0.8376 amu) 49.946 (0.0431 weight atomic = + + + = × + × + × + × = Naturally occurring chromium consists of four isotopes. It is 4.31% 24 50 Cr, mass = 49.946 amu, 83.76% 24 52 Cr, mass = 51.941 amu, 9.55% 24 53 Cr, mass = 52.941 amu, and 2.38% 24 54 Cr, mass = 53.939 amu. Calculate the atomic weight of chromium. Atomic Weight and Isotopic Abundance
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Unformatted text preview: The atomic weight of boron is 10.811 amu. The masses of the two naturally occurring isotopes 5 10 B and 5 11 B, are 10.013 and 11.009 amu, respectively. Calculate the fraction and percentage of each isotope. 10.811 amu = {(x)(10.013)} + {(1-x)(11.099)} amu = (10.013x + 11.009 - 11.009x) amu-0.198 amu = -0.996x so x = 0.199 i.e., the B-10 is 19.9% and the B-11 is 80.1% POINT OUT LOGIC!!...
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