Homework Help: Chemistry (Enthalpy)-College

Posted by Lucy on Sunday, October 31, 2010 at 7:10pm.

Given that:
2Al(s)+(3/2)O2(g)--->Al2O3(s)
change in H(rxn)= -1601 kJ/mol

2Fe(s)+(3/2)O2(g)--->Fe2O3(s)
change in H(rxn)= -821 kJ/mol

Calculate the standard enthalpy change for the following reaction:
2Al(s)+Fe2O3(s)--->2Fe(s)+Al2O3(s)

_______kJ

Chemistry (Enthalpy)-College - DrBob222, Sunday, October 31, 2010 at 7:57pm
Use equation 1 as is.
Reverse equation 2 (change the sign) and add to equation 1. Add the delta Hs to arrive at the total delta H for the new reaction.
Chemistry (Enthalpy)-College - Lucy, Sunday, October 31, 2010 at 8:25pm
Thank you so much :)

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