GRP SP11 Class 1 - Isotope Abundance (%) Mass(amu) 15 X...

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Class 1 page 1 Group Problems 1. A cube of an unknown metal measures 1.61mm on one side. The mass of the cube is 36mg. Which one of the following is most likely the unknown metal? Metal Density g/cm 3 a) Rhodium 12.4 b) Copper 8.96 c) Niobium 8.57 d) Vanadium 6.11 e) Zirconium 6.51 2. The element X has three naturally occurring isotopes. The masses and % abundances of the isoptopes are given in the table below. What is the average atomic mass of element X in amu?
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Unformatted text preview: Isotope Abundance (%) Mass(amu) 15 X 28.6% 15.33 16 X 13.3% 17.26 18 X 58.1% 18.11 a) 16.90 b) 16.33 c) 17.00 d) 17.20 3. Copper (Cu) has two naturally occurring isotopes. One ( 63 Cu) has an atomic mass of 62.9amu, the other ( 65 Cu) has an atomic mass of 64.8 amu. What are the % abundances of 63 Cu and 65 Cu? a) 50% 63 Cu, 50% 65 Cu b) 65.8% 63 Cu, 34.2% 65 Cu c) 22.9% 63 Cu, 77.1% 65 Cu d) 34.2% 63 Cu, 65.8% 65 Cu e) 89.3% 63 Cu, 10.7% 65 Cu...
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This note was uploaded on 07/16/2011 for the course CHEM 108 taught by Professor Bojan during the Fall '07 term at Pennsylvania State University, University Park.

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