If a liter of water has a mass of one kilogram, and a liter of mercury has a mass of 13.6 kilograms, which is more dense and why

Density is the amount of matter within a given amount of space. 

Water has a density of 1.0 gram per centimeter squared.

Mercury has a density of 13.6 grams per centimeter squared. 

Thus, within the same volume, mercury has more mass than water. Thus, mercury has a higher density. 

i wish i could but this one is weird give me abc and i can solve it.

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