12.66 g of calcium are heated in air,17.73 g of calcium oxide is formed.The percent oxygen in the compound is?
17.73g Calcium oxide - 12.66g Calcium = 5.07g Oxygen
Mass of the element / Mass of the compound * 100%
= 5.07g O / 17.73g CaO2 X 100%
= 28.6% of Oxygen in the compound
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