Asample originally contained 1.28 g of a radioisotope. it now contains 1.12 g of its daughter isotope.

the answer is learned

it's c. elements are placed in rows based on how may valencies electrons have.

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

answer7,570,82356 cubic centimeters;