Question 12(multiple choice worth 1 points) (02.03 hc) kim heated 12 g of substance a to obtain 4 g of substance b and a certain amount of substance c. which statement is correct? substance a and substance c have the same mass. substance b and substance c have the same mass. mass of substance c is twice the mass of substance b. mass of substance a is twice the mass of substance c.

the mass of substance c is twice of substance b. we know this through the law of conservation, so 12 > 4 + _, so substance C is 8, which is twice B

the answer is barium and copper bromide

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