What is the Ksp expression for the following dissolving reaction? Mg(OH)2(s) Mg+2(aq) + 2OH-(aq)

A.
Ksp = [Mg+2] [OH-]
B.
Ksp = [Mg+2]2 [OH-]
C.
Ksp = [Mg+2] [OH-]2
D.
Ksp = [Mg+2]2 [OH-]2

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Can someone me with 3 and 4 plz. this is for masteries test.