Ask Me Help Desk - What is the mass percent of copper in a compound?

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What is the mass percent of copper in a compound?

A pure compound contains only copper and oxygen. What is the mass percent of copper in the compound if a sample contains 4.441g copper and 0.559g of oxygen?

$\text{Percent mass of copper} = \frac{\text{Mass of copper}}{\text{Total mass of compound}}\ \times\ 100%$

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