# 30000 tonnes of a copper ore containing 6.5% chalcopyrite was mined. Calculate the theoretical yield of copper that could be extracted from this ore (in tonnes)?

Apr 21, 2017

$\text{Chalcopyrite}$ has a formula of ${\text{CuFeS}}_{2}$ (you should have included this formula in the question).

#### Explanation:

And thus percentage mass of copper in chalcopyrite is:

(63.55*g*mol^-1)/((63.55+55.8+2xx32.06)*g*mol^-1)xx100%

34.6% $\text{by mass.}$

But, the ore contains ONLY 6.5% by mass of copper in this ore......

And thus, the mass of copper is given by............

$\frac{6.5}{100} \times \frac{34.6}{100} \times 30000 \cdot \text{tonnes"=675*"tonnes}$.

And of course the rest of the starting mass will either be released to the atmosphere, or end up in a mountainous pile of tailings.