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In most of its ionic compounds, cobalt is either Co(II) or

Chemistry | 8th Edition | ISBN: 9780547125329 | Authors: Steven S. Zumdahl ISBN: 9780547125329 153

Solution for problem 115 Chapter 4

Chemistry | 8th Edition

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Chemistry | 8th Edition | ISBN: 9780547125329 | Authors: Steven S. Zumdahl

Chemistry | 8th Edition

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Problem 115

In most of its ionic compounds, cobalt is either Co(II) or Co(III). One such compound, containing chloride ion and waters of hydration, was analyzed, and the following results were obtained. A 0.256-g sample of the compound was dissolved in water, and excess silver nitrate was added. The silver chloride was filtered, dried, and weighed, and it had a mass of 0.308 g. A second sample of 0.416 g of the compound was dissolved in water, and an excess of sodium hydroxide was added. The hydroxide salt was filtered and heated in a flame, forming cobalt(III) oxide. The mass of cobalt(III) oxide formed was 0.145 g. a. What is the percent composition, by mass, of the compound? b. Assuming the compound contains one cobalt ion per formula unit, what is the formula? c. Write balanced equations for the three reactions described

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Anthropology 6: Selection in Mendelian World Main Idea: Selection in Mendelian World I. Constraints of Natural Selection 1. Only variants that are copied faithful enough can spread 2. Selection cannot create mutations that would be helpful 3. Selection is less able to control the frequencies of alleles that are rare and selectively neutral II. Only variants that are copied faithful enough can spread a. Faithfully enough so that copying errors don’t cancel out reproductive advantages b. Fidelity must be greater than the reciprocal of reproductive advantage c. Evolution is differential reproduction that is the result of differential fitness III. Selection

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Chapter 4, Problem 115 is Solved
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Textbook: Chemistry
Edition: 8
Author: Steven S. Zumdahl
ISBN: 9780547125329

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In most of its ionic compounds, cobalt is either Co(II) or