Asked by Ferb

Predict whether each of the following reactions would be spontaneous or non spontaneous under standard conditions or if it is impossible to tell with the data given.
a)2KClO3(s)+3C(s)-->3CO2(g)+2KCl(s) Exothermic

b) 2NO(g) + O2(g) ---> 2NO2(g) Exothermic

c)H2(g)+Zn(ClO3)2(s)-->2HClO3(l)+Zn(s) Endothermic


Does information come from the state the elements are in from reactant to product? I know that the exo/endothermic is useful but I do not remember how to use it.

Answers

Answered by DrBob222
Frankly, I think there is insufficient information for all of them. You need delta G. In a general sense exothermic reactions (delta H is -) often are spontaneous unless delta S screws things up and endothermic reactions (delta H is +) unless delta S screws things up. Technically, however, you need both delta H as well as T and delta S so you can calculate delta G from dG = dH - TdS.
Answered by Ferb
In the problem it states if the reactions underwent standard conditions, would that mean they would all have the same temperature and delta s meaning the only thing that would ,make the difference is the delta H?
Answered by DrBob222
I think standard conditions in this case means 25 C and 1 atm and ALL will have those conditions. What counts is dH and dS where
dHrxn = (n*dHf products) = (n*dHf reactants) and
dSrxn = (n*dSf products) - (n*dSf reatants) or
dGrxn = (n*dGf products) - (n*dGf reactants)
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