Final answer:
The term for the final state when molecules rearrange themselves into a stable combination at a prevailing temperature and pressure is equilibrium.
Step-by-step explanation:
The term for the final state when molecules rearrange themselves into a stable combination at a prevailing temperature and pressure is equilibrium. Equilibrium refers to the balance between reactants and products in a chemical reaction. It occurs when the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in a stable mixture of products and reactants.