when 3 mol A and 4 mol b placed in the container and allowed to come to equilibrium, the resulting mixture is found to contain 0.80 mol. what is the value of K at equilibrium?

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Ibelieve the answer is weathering,hope my answer has you : ) 

Answerkbr+f2 i believe this is the write answer