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The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm means 1 part of solute for every 106 parts of solution. Mathematically, by mass: ppm =mg solute/g solution=mg solute/kg solution In the case of very dilute aqueous solutions, a concentration of 1.0 ppm is equal to 1.0 g of solute per 1.0 mL, which equals 1.0 g solution. Parts per billion is defined in a similar fashion. Calculate the molarity of each of the following aqueous solutions.
a. 5.0 ppb Hg in H2O
b. 1.0 ppb CHCl3 in H2O
c. 10.0 ppm As in H2O
d. 0.10 ppm DDT (C14H9Cl5) in H2O
Three identical impedances of 30 ∠30° Ω are connected in delta to a three-phase 173-V system by conductors that have impedances of 0.8 + j0.6 Ω each. Compute the magnitude of the line-to-line voltage at the terminals of the load.
Give a description of the product and its physical and chemical properties, including a chemical structure drawing - Identify at least one company the produces your product and where the production facilities are located (city, country).
A mixture contains only NaCl and Fe(NO3)3. A 0.456-g sample of the mixture is dissolved in water, and an excess of NaOH is added, producing a precipitate of Fe(OH)3. The precipitate is filtered, dried, and weighed. Its mass is 0.107 g.
Formulate arguments for and against the idea that risk assesment can and should be separated from risk management. Discuss land as a natural resource and how and why it is or should be regulated by environmental laws.
Determine the membrane area needed. Given: Membrane properties and mass transfer information - Develop a process schematic
question 1 a the standard service illuminance for specific work activities is given in lux. what units are used in
An effluent disposal contractor is considering entering the recycled field. At present he incinerates an organic waste containing recoverable solvents and dumps the aqueous based effluent containing acids and metals.
Using the data given in Appendix C (available online at booksite .Elsevier.com/Towler), calculate the gross and net calorific values of the gas. Give your answer in MJ/m3 , at standard temperature and pressure.
Is this a reasonable number from a physiologic point of view when compared to the average velocity in the major and minor blood vessels in the human body?
In a device to produce potable water, humid air at 90°F, 29.7 in Hg, and 95% relative humidity iscooled to 40°F at constant pressure. What volumetric flow rate of air into the cooler (ft3/min) isrequired to provide 10.0 gal/min of condensed water?
Draw circuit diagrams and show polarity markings.
If a saturated solution of NaHCO3 at 60°C is cooled and comes to equilibrium at 30°C, what percentage of the dissolved salt crystallizes?
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