16. In the reaction diagram shown to the right, indicate the change in energy that takes place
during the reaction.
A. endothermic, Delta H+
B. endothermic, Delta H-
C. exothermic, Delta H+
D. exothermic, Delta H-

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l