How do i calculate stoichiometry mole to mole practice problems

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

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