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6 August, 00:30

A sample of copper wire with a mass of 1.659 g is heated with excess powdered sulfur until the copper has combined with the sulfur, and all the extra sulfur has been burned off. The final product (a sulfide of copper) has a mass of 2.080 g. Calculate the empirical formula of the product, and name it.

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  1. 6 August, 00:42
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    Copper mass = 1.659

    Copper moles = 1.659 / 64 = 0.0259

    Sulfur mass = 2.08 - 1.659 = 0.421

    Sulfur moles = 0.421 / 32 = 0.0131

    Ratio Copper : Sulfur = 2 : 1

    Empirical formula: Cu ₂ S

    Name: Copper (I) sulfide
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