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What is the mass of percent of oxygen in the compound `UO_(2)(C_(2)H_(3)O_(2))_(2) NH_(4)C_(2)O_(2).6H_(2)O`?
`{:(,"Formula Weight g" ,), (,UO_(2)(C_(2)H_(3)O_(2)).6H_(2)O = 573,):}`
A. 0.0558
B. 0.168
C. 0.223
D. 0.391

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