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Problem- A series of full-period consecutive dust samples are collected during an 8 hour work shift. Samples were collected on filters and weighed gravimetrically, with results as follows:
Sample no Flowrate (liters per min) Sample Duration (min) Mass Collected (micrograms ug) 1) 2.0 60 110 2) 2.0 120 745 3) 2.0 90 350 4) 2.0 120 700 5) 2.0 90 255 What is the 8 hour TWA concentration in milligrams per cubic meter (mg/m^3)? The final units are in mg/m^3. You have mass in ug. You also have minutes and liters per minute. That should tell you how many liters of air were sampled. Airborne concentration is in mass per volume of air. You can calculate ug/l. Convert to mg/m^3 and then calculate the 8 hour TWA (show all work please)
Solve the above problem and provide steps with explanation
A chemist is commissioned to produce 50,000 liters of 0.550 M aqueous phosphoric acid. The chemist can purchase solid, 98.64% pure, phosphoric acid to dissolve in water. How many grams of this reagent are required?
Over the time interval 300 to 400 seconds, the rate of reaction with respect to A is delta[A]/delta t =3.7 x 10^-5M/s. Over the same time interval what is the rate of reaction with respect to B,
Calculate the mass of nitrogen dissolved at room temperature in an 92.0L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
how many grams of dry nh4cl need to be added to 2.30 l of a 0.100 m solution of ammonianh3 to prepare a buffer solution
A stock solution is prepared by adding 23 mL of 1.6 M Pb(ClO3)2 to enough water to make 50 mL. How many moles of ClO3- are in 24 mL of the stock solution?
What is the pH of a solution that is 0.30 M in aniline, C6H5NH2, and 0.15 M in anilinium chloride, C6H5NH3+Cl-? (Kb = 4.2 × 10-10 for aniline) Aniline ionizes as: C6H5NH2 + H2O C6H5NH3+ + OH-
What is the balanced education and stoichiometric reagents needed with mole calculations of 1 sodium hydroxide pellet(0.075 to 0.095 g) and 0.24 g acetophenone and 0.11 g benzaldehyde
For the reaction SO3+H2O=H2SO4 calculate the percentage yield if 600 g of sulfur trioxide react with excess water to produce 475 g of sulfuric acid
Draw a potential energy diagram for the rotation about the 3,4 carbon-carbon bond plotting potential energy versus torsion angle for 2-methylhexane
Based on coulombic attractions, list the magnitude of attraction between ions from the least to highest. why? Nacl, Na2SO4, MgSO4
Make educated guesses at the pictures for the LGO's for tetrahedral and octahedral. Propose the appropiate pictures for the LGO's symmetry labels for the square pyramidal Cr(CO)5. With your pictures, can you justify the energy levels for the bondi..
Show the orbital-filling diagram for (nitrogen). Stack the subshells in order of energy, with the lowest-energy subshell at the bottom and the highest-energy subshell at the top.
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