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April 24, 2015

Homework Help: Chemistry

Posted by Christina on Monday, November 16, 2009 at 8:52am.

Using G (measure of free energy) to determine wether the reaction 4Fe(s)+3O2(g)-> 2Fe2O3(s) is spontaneous at 25C, given that H=.393kcal and S=-0.13 kcal/(mol*K).

Is the reaction more or less spontaneous at 1000C assuming that H and S remain constant with temperature?

G at 25C is -354.26(and im not sure what type of units to put it in)
G at 1000C is -227.51.

I do not know how to tell if the reaction is spontaneous at 25C or how to tell if it is more or less spontaneous at 1000C.

Thanks for your help!!!

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