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compound weighing 115 g contains 68.3 g of carbon, 13.2 g of hydrogen, 15.9 g of nitrogen, and some amount of oxygen. What is the mass percent of oxygen in the compound?
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compound weighing 115 g contains 68.3 g of carbon, 13.2 g of hydrogen, 15.9 g of nitrogen, and some amount of oxygen. What is the mass percent of oxygen in the compound?

User Lone Shepherd
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The mass percent means that the mass of this element divide the total mass of the compound. The oxygen amount equals 115-68.3-13.2-15.9=17.6. The mass percent is 17.6/115*100%=15.3%.
User Kneemin
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