Consider the reaction: Mg(OH)₂ (s) ⇌ Mg²⁺ (aq) + 2 OH⁻ (aq)
At equilibrium, a 1.0 L reaction vessel contains 5.3 moles of Mg(OH)₂ and concentrations of 0.0080 M and 0.010 M of Mg²⁺ and OH⁻ respectively. What is Kc for this equilibrium?

8.0 x 10⁻⁷

Explanation:

[Mg²⁺][OH⁻]² = [0.008] [0.010]² = 8.0 x 10⁻⁷

(Solids and Liquids do not appear in the expression)

beta decay is the answer

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-