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OpenStudy (anonymous):
Magnesium combines with oxygen to form magnesium oxide. If 15.14 g of magnesium reacts completely with 7.68 g of oxygen, what is the percent by mass of oxygen in magnesium oxide?
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OpenStudy (aaronq):
add up the two values to get a total mass. then divide each component by the total and multiply by 100 to get a percent value.
OpenStudy (anonymous):
So i would do 15.4 + 7.68 = 23.08 then divide what?
OpenStudy (aaronq):
divide each component (each individual mass) by the total and multiply by 100 to get a percent value.
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