Chalcopyrite (cufes2) is an abundant copper mineral that can be converted into elemental copper through the four step process below.
a) calculate the mass of cu in g from 5.40 kg cufes2.
i got 1.87e3g of cu.
b)calculate the mass of cufes2 needed in g to produce 150.0 g cu if the yield for the conversion process is 82%.

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quartz

explanation:

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72