20218 - Chemistry Practice Problems#2 1 Consider two...

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Chemistry Practice Problems #2 1. Consider two compounds of carbon and oxygen. In the first, 1.000 g of carbon combines with 1.332 g of oxygen. In the second, 1.000g of carbon requires 2.664 g of oxygen. Does this illustrate "Multiple Proportions"? 2. Rank the following isotopes from lowest to highest, in terms of: (i) mass (ii) number of neutrons (iii) number of electrons. a) 29 14 Si b) 56 29 Cu c) 112 50 Sn d) 107 47 Ag e) 59 26 Fe f) 42 18 Ar 3. The combustion of 0.214 g of sulfur provided exactly 0.428 g of sulfur dioxide. After a second try, 0.782 g of SO 2 was obtained. What mass of sulfur was used? 4. Magnesium has three natural isotopes: 24 Mg (isotopic mass 23.9850 amu, abundance 78.99%); 25 Mg (isotopic mass 24.9858 amu, abundance 10.00%); 26 Mg (isotopic mass 25.9826 amu, abundance 11.01%). Calculate the atomic mass. 5. Which isotope has an equal number of neutrons and electrons? a)
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This note was uploaded on 04/03/2011 for the course CHEM 112 taught by Professor Harwood during the Spring '11 term at Purdue.

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20218 - Chemistry Practice Problems#2 1 Consider two...

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