4. Solid cuprous oxide (CuO) is being reduced to solid Cu metal by hydrogen gas (H) in a furnace at 1,000 K. (a) Write the chemical reaction for the reduction of one mole of CuO. (b) How much heat is released or absorbed per mole reacted at this temperature? Is the reaction exothermic or endothermic? The relevant data can be found from Appendix I of textbook (Lee)(also available in the file "204 handouts - Thermodynamic data" in eClass). Phase change of the reactants and products can be ignored since the melting points of copper and CuO are much higher than 1000 K.