Chemistry Homework Help

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ppm

Q. Formaldehyde is a carcinogenic volatile organic compound with a permissible exposure level of 0.75 ppm. At this level, how many grams of formaldehyde are permissible in a 6.0-L breath of air having a density of 1.2 kg/m^3? A) 5.4 g formaldehyde B) 3.8 × 10^-2 g formaldehyde C) 5.4 × 10^-6 g formaldehyde D) 3.8 g formaldehyde

Solved • Jul 15, 2019

ppm

Q. A 4.55 L sample of water contains 0.115 g of sodium ions. Determine the concentration of sodium ions in ppm if the density of the solution is 1.00 g/mL. A) 36.5 ppm B) 52.3 ppm C) 12.7 ppm D) 13.2 ppm E) 25.3 ppm

Solved • Jul 15, 2019

ppm

Q. A 900.0 g sample of drinking water contains 0.0420 mg chlorobenzene (C6H5Cl). (a) Express the concentration of chlorobenzene in ppm (parts per million). ppm (b) What is the molality of chlorobenzene in the solution?

Solved • Jul 8, 2019

ppm

Q. Parts per million of a component in a solution is calculated using the following equation. ppm of component = masstotal mass of componentx of solution 10*6 What is the mass, in grams, of a contaminant found to be present at 1.52 ppm in a pond having a total mass of 5.3 x 101° kg?

Solved • Jul 8, 2019

ppm

Q. 2.97 grams of solid uranyl nitrate are dissolved in 2.73 L of water at 20°C. Calculate the concentration of uranyl nitrate in parts-per-million. ρH2O 1.00 g = 1.00 mL

Solved • Jun 7, 2019

ppm

Q. 1.70 grams of solid uranyl nitrate are dissolved in 1.71 L of water at 20°C. Calculate the concentration of uranyl nitrate in parts-per-million.

Solved • Jun 7, 2019

ppm

Q. The level of carbon monoxide in a coal mine atmosphere is found to be 12 ppm. Find the volume of CO per cubic meter of air in the coal mine?

Solved • May 8, 2019