Question 3 of 13 Map General Chemistry 4th Editiop University Science Books pres

Question

Question 3 of 13 Map General Chemistry 4th Editiop University Science Books presented by Sapling Learning uarrie The oxidation of copper(l) oxide, Cu20(s), to copper(Il) oxide, CuO(s), is an exothermic process. e change in enthalpy upon reaction of 68.85 g of Cu20(s) is -70.25 kJ. Calculate the work, w, and energy change, AUrxn, when 68.85 g of Cu20(s) is oxidized at a constant pressure of 1.00 bar and a constant temperature of 25 °C. Number Number Note that AErxn is sometimes used IkJl 1," =1 kJl asthed omb olfor energy change instead of Urxn. rxn

Explanation / Answer

no of mol of Cu2O Rreacted = 68.85/143.1 = 0.48 mol

so that,

no of mol of O2 reacted = 0.48*1/2 = 0.24 mol

Dn = 0.24 , R = 8.314 j.k-1.mol-1 , T = 25 c = 298 k

work(w) = DnRT

         = 0.24*8.314*298

          = 594.62 j

          = 0.594 kj

     DH = DU + DnRT

-70.25 = x + 0.594

x =DUrxn = -70.844 kj

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