Percent Composition Notes

Labeling

What is the equation for percent composition?

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mass of the element

number of atoms in the compound

part

mass of the compound

number of atoms of the element

total

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What is the percent composition of copper in copper(I) sulfide? (Practice the four-step method)

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What is the percent composition of sulfur in copper(I) sulfide? (Practice the four-step method)

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A 2.4 g sample of magnesium is burned in oxygen and forms 4.0 g of magnesium oxide.  What is the percent composition of magnesium in the compound?

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A 3.2 g sample of sulfur is burned in oxygen and forms 6.4 g of sulfur dioxide. What is the percent composition of oxygen in the compound?