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23 solutions

ppm

#### Q. What is the concentration (by mass) of the solute in a solution prepared by dissolving 2.50x10^-7 mol Na3PO4 in 1 L of water (in ppm, ppb, and ppt, all two decimal places)?

Solved • Sep 22, 2019

ppm

#### Q. Calculate the concentration in ppm of a pollutant that has been measured at 450 mg per 150 kg of sample. a) 3.0 ppm b) 330 ppm c) 3000 ppm d) 6.0 ppm e) none of the above

Solved • Nov 7, 2019

ppm

#### Q. The mole fraction of neon in the air is about 2.6 x 10–5. If the average molar mass of air is 28.96 g/mol what is the concentration of neon in air in ppm?

Solved • Oct 7, 2019

ppm

#### Q. The average lithium ion concentration in seawater is 0.20 ppm. What is the molality of Li^+ in seawater?

Solved • Sep 23, 2019

ppm

#### Q. 7. What is the concentration (by mass) of the solute in a solution prepared by dissolving 2.50 x 10^-7 mol Na3PO4 in 1 L of water (in ppm, ppb, and ppt, all to two decimal places)?

Solved • Sep 20, 2019

ppm

#### Q. A 2.350x10^-2 M solution of a NaCl in water is at 20.0 degrees C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined the volume of water needed to do this was 999.4 mL. The density of water at 20.0 degrees C is 0.9982 g/mL. Calculate the concentration of the salt solution in parts per million. Express your answer as an integer to four significant figures and include the appropriate units.

Solved • Sep 9, 2019

ppm

#### Q. A 1.00 L sample of water contains 0.0036 g of Cl− ions. Determine the concentration of chloride ions in ppm if the density of the solution is 1.00 g/mL. A) 5.4 ppm B) 2.8 ppm C) 1.8 ppm D) 7.2 ppm E) 3.6 ppm

Solved • Jul 15, 2019