A sample of Co-60 has a mass of 20.0 grams initially. Given that the half-life for this radioisotope is 5 years, how many grams of the sample will still be Co-60 after four half-lives?

your answer is c) plasma

~*"auba14"*~

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