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?

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

Explanation:

The valency of chlorine is 1 .It means that chlorine has seven valence electrons in its valence shell so it gains one electron from others to be stable during chemical reaction. so its valency is 1.

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