Energy Released from Oxidation

Question

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

2Cu₂O(s) + O₂ (g) ----->  4 CuO (s)  

ΔH°_rxn = -292.0 kJ/mol

Calculate the energy released as heat when 49.43 g Cu₂O (s) undergo oxidation at constant pressure.

Answer 1

molar mass Cu2O = 143 g/mol

49.43 g Cu2O x 1 mol / 143 g x -292.0 kJ/mol = -100.9 kJ