The oxidation of copper(I) oxide, Cu2O(s), to copper(II) oxide, CuO(s), is an exothermic process, 2Cu2O(s) + O2(g)...

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The oxidation of copper(I) oxide, Cu2O(s), to copper(II) oxide,CuO(s), is an exothermic process,
2Cu2O(s) + O2(g) ----> 4CuO(s) Delta H (reaction)= -292.0 Kj/mol
Calculate the energy released as heat when 9.67 g of Cu2O(s)undergo oxidation at constant pressure.

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4.2 Ratings (926 Votes)

Molar mass of Cu2O = 143 g/mol
mass of Cu2O = 9.67 g
number of moles of Cu2O, n = mass / Molar mass
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 9.67 / 143
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.0676 mol

energy released = 292 KJ/mol * 0.0676 mol
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 19.75 KJ
Answer: 19.75 KJ

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