An iron bar weighed 664 g. After the bar had been standing
Chapter 8, Problem 71AP(choose chapter or problem)
An iron bar weighed \(664 \mathrm{~g}\). After the bar had been standing in moist air for a month, exactly one-eighth of the iron turned to rust \(\left(\mathrm{Fe}_2 \mathrm{O}_3\right)\). Calculate the final mass of the iron bar and rust.
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