SOLVED: When copper (II) oxide is heated in the presence of hydrogengas, elemental copper and water are produced. What mass of coppercan be obtained if 32.0 g of copper (II) oxide is used?

SOLVED: The oxidation of copper(I) oxide, Cu2O(s) , to copper(II) oxide,CuO(s) , is an exothermic process. 2Cu2O(s) O2(g)⟶4CuO(s) Thechange in enthalpy upon reaction of 37.04 g Cu2O(s) is −37.79 kJ .Calculate the work, 𝑤 , and energy change, Δ𝑈rxn , when 37.04 gCu2O(s) is oxidized at a constant pressure of 1.00 bar and aconstant temperature of 25∘ C . Note that Δ𝐸rxn is sometimes usedas the symbol for energy change instead of Δ𝑈rxn .

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