Chemistry Homework Help

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ppm

#### Q. Describe how you would prepare 250ml of 70 ppm Pb from Pb(NO3)2

Solved • Mar 6, 2020

ppm

#### Q. Find the concentration of calcium (in ppm) in a 3.50 g pill that contains 40.5 mg of Ca.

Solved • Feb 29, 2020

ppm

#### Q. A 2.650x10^-2 M solution of glycerol (C3H8O3) in water is at 20.0°C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 998.9 mL. The density of water at 20.0°C is .09982 g/mL. Calculate the concentration of the glycerol solution in parts per million. Express your answer as an integer to four significant figures and include the appropriate units.

Solved • Feb 7, 2020

ppm

#### Q. Express the concentration of a 0.0860 M aqueous solution of fluoride, F−, in mass percentage and in parts per million (ppm). Assume the density of the solution is 1.00 g/mL.

Solved • Feb 6, 2020

ppm

#### Q. The concentration of a solution expresses a ratio with an amount of solute in the numerator. In which of the following concentration scales is the denominator a term involving an amount of solvent? a) Molarity b) Molality c) Parts per million d) Mole fraction

Solved • Jan 31, 2020

ppm

#### Q. A 2.300x10^-2 M solution of glycerol (C3H8O3) in water is at 20.0°C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.0 mL. The density of water at 20.0°C is .09982 g/mL. Calculate the concentration of the glycerol solution in parts per million. Express your answer as an integer to four significant figures and include the appropriate units.

Solved • Jan 31, 2020

ppm

#### Q. PQ-8. A 1400 g sample of stream water contains 12.2 ppm of mercury. What is the mass of Hg in the sample? a) 0.11 mg b) 2.4 mg c) 8.7 mg d) 17 mg

Solved • Dec 13, 2019