A newly discovered bacterium can reduce selenate ion, SeO , 42-( aq)  to elemental selenium, Se(s), in reservoirs. This is significant because the soluble selenate ion is potentially toxic, but elemental selenium is insoluble and harmless. Assume that water is oxidized to oxygen as the selenate ion is reduced. Compute the mass of oxygen produced if all the selenate in a 1012-L reservoir contaminated with 100 mg L-1 of selenate ion is reduced to selenium.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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A newly discovered bacterium can reduce selenate ion, SeO , 42-( aq)  to elemental selenium, Se(s), in reservoirs. This is significant because the soluble selenate ion is potentially toxic, but elemental selenium is insoluble and harmless. Assume that water is oxidized to oxygen as the selenate ion is reduced. Compute the mass of oxygen produced if all the selenate in a 1012-L reservoir contaminated with 100 mg L-1 of selenate ion is reduced to selenium.

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