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Gravimetric analysis of Fe3O4 (MW = 232 g/mole) may be undertaken with the following reactions:  Fe3O4 → Fe2O3 → Fe (OH)3. Weight of sample containing 8.00% Fe3O4 that must be taken to obtain a precipitate of Fe(OH)3 (MW = 107 g/mole) that weighs 150 mg is .

Gravimetric analysis of Fe3O4 (MW = 232 g/mole) may be undertaken with the following reactions:  Fe3O4 → Fe2O3 → Fe (OH)3. Weight of sample containing 8.00% Fe3O4 that must be taken to obtain a precipitate of Fe(OH)3 (MW = 107 g/mole) that weighs 150 mg is .

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 80AP
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Gravimetric analysis of Fe3O4 (MW = 232 g/mole) may be undertaken with the following reactions:  Fe3O4 → Fe2O3 → Fe (OH)3.

Weight of sample containing 8.00% Fe3O4 that must be taken to obtain a precipitate of Fe(OH)3 (MW = 107 g/mole) that weighs 150 mg is .

a.  0.108 g 

b. 0.325 g

c. 1.355 g

d. 4.065 g

             Amount of Fe2O3 (MW = 160 g/mole) from which 150 mg of Fe(OH)3 (MW = 107 g/mole) may be obtained is .

             a.  0.112 g

             b.  0.224 g

             c.  0.448 g

             d. none of the other choices

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