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

Question

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

Answer 1

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

Answer 2

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Answer 3

Option (d ) is correct.

(a) is a highly exothermic reaction.

(b)Here ΔH is (-) & ΔS is (+) => ΔG is "negative".