The percent by mass of nitrogen for a compound is found to be 46.7% Which of the following could be this species?

% Nitrogen = 46.7%

% Oxygen = 100% - 46.7% = 53.3%

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