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    Hi, I'm having trouble with this question:
    1000 tonnes of impure copper ore is dug out of the ground. Only 1% of this is pure mineral, CuFeS2. What mass of the Cu could be made from the 1000 tonnes of the impure ore?


    1000/100 = 10 tonnes of pure mineral

    Mr of the mineral = 183.5, Ar of copper = 63.5

    63.5/183.5 x 100 = 34.6% by mass of copper

    34.6% x 10 tonnes = 3.46 tonnes

    That's what I'd go for anyway, someone please correct me if wrong!
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