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Magnesium is used in lightweight alloys for airplane bodies and other structures. The metal is obtained from seawater in a process that includes precipitation, neutralization, evaporation, and electrolysis. How many kilograms of magnesium can be obtained from 0.069km^3 of seawater if the initial Mg^+2 concentration is 0.16% by mass? (d of seawater = 1.04g/mL)

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