Answer: A dioxin-contaminated water source contains 0.085% dioxin by mass. How much

Solution: Here, we are going to calculate the mass of dioxin present in 2.5 L of a dioxin- contaminated water solution containing 0.085 % dioxin by mass.

Step1:

The mass percentage of a component of a solution is defined as:

 Mass of the component in the solution

 Mass % of a component = ----------------------------------------------------- × 100         ---(1)

                                        Total mass of the solution

Step2:

Again, density may be defined as mass per unit volume.

Thus,

                                d = m / v