Which of the following processes has a negative standard free energy change at 25°C?

a) CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g)


b) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g)


c) 2H2O (l) → 2H2 (g) + O2 (g)


d) Both a and b

Which of the following processes has a negative standard free energy change at 25°C?
a definitely, b i'm not so sure. Rule of thumb, if a chemical reaction releases heat, it is a negative free energy change. So, when you add sodium to water, does it heat up? i believe it may but i don't know for sure





i can tell you it is definitely a positive free energy change to split up water into oxygen and hydrogen.





so, either a or d
Reply:Option (d ) is correct.





(a) is a highly exothermic reaction.





(b)Here ΔH is (-) %26amp; ΔS is (+) =%26gt; ΔG is "negative".