A sample of hydrogen gas at a pressure of 0.803 atm and a temperature of 26.5 °C, occupies a volume of 867 mL. If the gas is allowed to expand at a constant temperature until its pressure is 0.418 atm, the volume of the gas sample will be in mL.

i'm pretty sure its b i might be wrong though!

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

answermeridional ;