how many moles of Ca and O2 do you have?
Each mole of O2 uses 2 moles of Ca, so check to see which will run out first. Then change the moles of CaO back to grams.
2Ca(s)+O2(g)--->2CaO(s)
Calculate the mass of calcium oxide that can be prepared from 8.99 g of Ca and 5.99 g of O2.
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