posted by Christina on .
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!!!
The sign of DG determines if a reaction is spontaneous or not.
* DG < 0: the reaction is spontaneous
* DG > 0: the reaction is not spontaneous
* DG = 0: the reaction is at equilibrium .
Be certain you worked temperatures in K, not C.
I worked in K.... so at either temp the reaction is not spontaneous? but it is more spontaneous at 1000C?
IT is negative, so spontaneous at both temps. It is more negative at 25C.