Complete and balance the equations for the following thermite reactions. Use the

Question

Complete and balance the equations for the following thermite reactions. Use the lowest possible whole-number coefficients.

- How much CuO would you need to react with excess aluminum to generate same amount of heat as 133 g of Fe2O3 does when reacted with excess aluminum?

Complete and balance the equations for the following thermite reactions Use the lowest possible whole-number coefficients Al+ Fe2O3 11. -827 kJ / mol rxn AH1170 kJ/mol rxn How much CuO would you need to react with excess aluminum to generate sam e amount of heat as 133 g of Fe203 does when reacted with excess aluminum? Number

Explanation / Answer

Fe2O3 + 2 Al ------> 2 Fe + Al2O3

3 CuO + 2 Al ------> 3 Cu + Al2O3

number of moles of Fe2O3 = 133 / 160 = 0.8315 moles

1 mole of Fe2O3 produces 1 mole of Al2O3

1 mole of Al2O3 requires 3 moles of CuO

0.8315 moles of Al2O3 requires 3 * 0.8315 moles of CuO

                                                         = 2.4937 moles

mass of CuO = 2.4937 * 79.5 = 198.25 g

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