6. An object has a mass of 0.125 lb. When it is submerged in a graduated cylinder initially containing 19.6 mL of water, the water level rises to 39.9 mL. (given 2.2 lb = 1.0 kg, 1000 g =1.0 kg)

This is an incomplete question, here is a complete question.

An object has a mass of 0.125 lb. When it is submerged in a graduated cylinder initially containing 19.6 mL of water, the water level rises to 39.9 mL. What is the density (g/mL) of the object?

(given 2.2 lb = 1.0 kg, 1000 g =1.0 kg)

Answer : The density of object is, 2.79 g/mL

Explanation :

First we have to calculate the mass of object in terms of grams.

Conversion used:

2.2 lb = 1 kg = 1000 g

That means,

2.2 lb = 1000 g

So, 0.125 lb =

Now we have to calculate the volume of object.

Volume of object = Volume of water level rises - Initial volume of water

Volume of object = 39.9 mL - 19.6 mL

Volume of object = 20.3 mL

Now we have to calculate the density of object.

Therefore, the density of object is, 2.79 g/mL

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