A first-stage recovery of magnesium from seawater is precipitationof Mg1OH22 with CaO:Mg2+(aq) + CaO(s) + H2O(l)---->Mg(OH)2(s) + Ca2+(aq)   What mass of CaO, in grams, is needed to precipitate 1000lb of Mg(OH)2?

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