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An industrial hygienist conducting personal sampling on a worker who is overseeing a production process involving use of acetone (Note: The Occupational Safety and Health Administration has established a Permissible Exposure Limit of 1000 parts per million (ppm) of acetone). You are able to measure the following exposures:
700 ppm for 3 hours 1300 ppm for 2 hours 900 ppm for 3 hours What is the calculated TWA? What would you tell plant management in terms of exposure to acetone and compliance with the PEL?
When 0.100g of graphite is burned completely in a bomb calorimeter(heat capacity =3.344kJ/?C), containing 3000 g of water, a temperature rise of 0.21?C is observed.
Calculating concentration at equilibrium, The equilibrium constant Kc for the reaction is 54.3 at 430 deg C
Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years.
Calculate the de Broglie wavelength, in nm, of a baseball of 5.25 ounces with a speed of 97.0 mph
What would happen to the A450 value for a smaple which include : 1mL of 0.0025M Fe(NO3)3 + 1mL of 0.0025M KSCN + 5.0mL of 0.1M HNO3 , if you accidentally added 5 drops of disodium hydrogen phosphate
For a standard cell made using gold (Au) and gold (III) nitrate, and cobalt and cobalt (II) nitrate Calculate the Ecell if the concentration of Au(NO3)3 is 0.27 M and the concentration of Co(NO3)2 is 0.74 M.
Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.
Calculate how many mL of 6M HCl are needed to prepare 100mL HCl solution with a concentration of ~1M.
A human body contains 6 liters of blood. The hemoglobin content of blood is about 15.5g/100 mL of blood. The approximate hemoglobin molecular weight is 64,500g/mol. How many moles of hemoglobin are present in a typical adult
Two hypothetical ionic compounds are discovered with the chemical formulas XCl2 and YCl2, where X and Y represent symbols of the imaginary elements. Chemical analysis of the two compounds reveals that 0.25 mol XCl2 has a mass of 100.0 g and 0.50 m..
Show the full mechanism of bromination for both 2,4-nitrophenol
A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume of household bleach that should be diluted with water to make 500.0 mL of a pH = 9.80..
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