Answer
2.146 g
Work Step by Step
It is given that a dioxin-contaminated water source contains 0.085% dioxin by mass.
That means, 100 g of water contains 0.085 g of dioxin.
The density of the solution is 1.01 g/mL.
2.5 L = 2500 mL = 2500 X 1.01 g = 2525 g
For 100 of water → 0.085 g
For 2525 g → ?
= (0.085 X 2525)/(100)
= 2.146 g