Question

What is the concentration in ppm of a 3.7 L solution (d = 1.00 g/mL) containing 4.21 × 10-7 kg of the pesticide DDT?

Answer 1

Answer:

concentration in ppm of DDT =  0.011 ppm

Explanation:

since ppm of DDT =mg of DDT /Kg of solution ( or μg of DDT /g of solution) , then

concentration in ppm of DDT = 4.21 × 10⁻⁷ kg * 10⁶ mg/kg / ( 1.00 g/mL * 3.7 L * 1000 ml/L  * 1 kg/1000gr) = 0.011 ppm

then

concentration in ppm of DDT =  0.011 ppm