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What is the concentration in ppm of a 3.7 l solution (d = 1.00 g/ml) containing 4.21 x 10-7 kg of the pesticide DDT? Question 12 options: 1.14 x 10^-1 ppm 1.14 x 10^5 ppm 1.14 x 10^2 ppm 1.14 x 10^1 ppm
Accepted Answer
Here's how to calculate the concentration in ppm:
1. Convert everything to the same units:
- Convert the volume of the solution from liters to milliliters: 3.7 L
1000 mL/L = 3700 mL
- Convert the mass of DDT from kilograms to grams: 4.21 x 10^-7 kg
1000 g/kg = 4.21 x 10^-4 g
2. Calculate the mass of the solution:
- Use the density to find the mass: 3700 mL
1.00 g/mL = 3700 g
3. Calculate the concentration in ppm (parts per million):
- ppm = (mass of solute / mass of solution)
10^6
- ppm = (4.21 x 10^-4 g / 3700 g)
10^6
- ppm ≈ 1.14 x 10^-1 ppm
Therefore, the correct answer is 1.14 x 10^-1 ppm.
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