HELP! ME PLEASE?

The most common source of copper (Cu) is the mineral chalcopyrite ( CuFeS2 ). How many kilograms of chalcopyrite must be mined to obtain 460. g of pure Cu?

Express your answer to three significant figures and include the appropriate units.

1 Answer

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  • 3 weeks ago

    Number of mol of Cu = mass / molar mass

    = 460 g / 63.546 g/mol = 7.24 mol

    Each mol Cu is prepared from one mol chalcopyrite

    So number of mol of mineral required = 7.24 mol

    Mass of chalcopyrite = mol x molar mass

    = 7.24 mol x 183.52 g/mol

    = 1328 g

    Mass of chalcopyrite in kg = 1328/ 1000 kg

    = 1.33 kg

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