How many grams of potassium chloride must decompose to produce 69.9 milliliters of potassium metal, if the density of potassium is 1.78 g/ml? show all steps of your calculation as well as the final answer.

Explanation:

It is known that density is mass divided by volume of a substance.

Mathematically,        Density =

Since, it is given that volume is 69.9 mL and density is 1.78 g/mL.

Hence, calculate the mass as follows.

            Density =

               1.78 g/mL =

                 mass = 124.42 g

Thus, we can conclude that mass of potassium chloride is 124.42 g.