Write the overall equation for reducing Cu2S to metallic copper.
◦ Cu2S(l) + C(s) → 2 Cu(l) + CS(g)
◦ Cu2S(l) + CO(g) → 2 Cu(l) + CO(g) + S(s)
◦ Cu2S(l) + 2 CO(g) + O2(g) → 2 Cu(l) + 2 CO2(g) + S(s)
◦ Cu2S(l) + 3 O2(g) → 2 Cu(l) + S(s) + 2 O3(g)
◦ Cu2S(l) + O2(g) → 2 Cu(l) + SO2(g)