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April 18, 2015

Homework Help: Chemistry

Posted by Shadow on Monday, May 13, 2013 at 2:37pm.

Find the enthalpy for : 4Fe + 3O2 = 2Fe2O3

I got the following informations:
Fe + 3H2O = Fe(OH)3 + 3/2H2 - Enthalpy is 160.9 kj
H2 + 1/2O2 = H2O - Enthalpy is -285.8 kj
Fe2O3 + 3H2O = 2Fe(OH)3 - Enthalpy is 288.6

I try using Hess Law but cannot solve it. Can anyone help me find the enthalpy? Thanks

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