What is the mole fraction of potassium dichromate, k2cr2o7, in a solution prepared from 24.42 g of potassium dichromate and 240. g of water? report your answer in scientific notation with three significant figures

is the mole fraction of potassium dichromate.

Explanation:

Mass of potassium dichromate = 24.42 g

Moles of  potassium dichromate =

Mass of water = 240.0 g

Moles of water =

Mole fraction is calculated by:

is the mole fraction of potassium dichromate.

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