Compound stability with respect to decomposition

[Sierra Cheslick 2B]

Why does having a negative deltaG make a compound unstable with respect to decomposition?

[Neil Hsu 2A]

Looking at a decomposition reaction, let's say A --> B + C, if the reaction has a negative delta G, then the decomposition reaction is spontaneous, or favorable. This means that A has a tendency to decompose into B and C; in other words, we can say that A is unstable.

[Albert Duong 4C]

I believe because a negative delta g indicates that a reaction is spontaneous (more likely to occur or favorable), and if that compound is unstable it means that its more likely to revert back to its pure elements (hence, decomposition).

[Kelsey Warren 1I]

If delta G is negative, then the forward reaction is favored, which means that the reactants are unstable and will decompose into the products spontaneously.