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OpenStudy (anonymous):
A compound that contains 17.6 g of iron and 10.3 g of sulfur has a total mass of 27.9 g. What is the percent composition of this compound?
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OpenStudy (jfraser):
you know the mass of each piece, and you know the total mass. Percent composition is:\[\%Fe = \frac{mass Fe}{mass FeS}\] plug and solve
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