There are two steps in the extraction of copper metal from chalcocite, a copper ore. In the first step, copper(1) sulfide and oxygen react to form copper(1) oxide and sulfur dioxide: 2 Cu,S(s) + 30,(g) → 2Cu,O(s) + 2 SO,(g) In the second step, copper(I) oxide and carbon react to form copper and carbon monoxide: Cu,O(s) + C(s) → 2 Cu(s) + CO(g) Suppose the yield of the first step is 84.% and the yield of the second step is 65.%. Calculate the mass of oxygen required to make 7.0 kg of copper. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.

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Photochemistry

Photochemistry is the part of chemistry that studies the various mechanisms of reactions that are triggered by the presence of light energy. It also helps to study the changes involved in a molecule that can undergo the absorption of radiation.