19. The balanced equation 2Cu(s) + O2(g) → 2CuO(s) tells us that 4.0 mol of Cu
(A) reacts with 4.0 mol of O2
(B) produces 4.0 mol of CuO
(C) must react with 128 g of O2
(D) cannot react with oxygen
(E) produces 8.0 mol of CuO

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