The easy. I just didn't go through the mopls steps.
976 tons ZnCO3 x 0.78 = approx 750 tons ZnCO3
750 tons ZnCO3 x (atomic mass Zn/molar mass ZnCO3) = ? tons Zn metal.
How many tons of zinc can be obtained from 976 tons of zinc ore that is 78.0% zinc carbonate?
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