Measurements also show that a certain sample of the unknown compound contains 8.00mol of oxygen and 2.67mol of chromium. write the complete chemical formula for the unknown compound.

Answer : The chemical formula for the given compound is

Explanation : Given,

Moles of oxygen = 8.00 mole

Moles of chromium = 2.67 mole

To formulate the chemical formula, we need to follow some steps:

Step 1: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 2.67 moles.

For Oxygen =

For Chromium =

Step 2: Taking the mole ratio as their subscripts.

The ratio of Cr : O = 1 : 3

Hence, the chemical formula for the given compound is

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