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Sample were collected in a zinc smelter to determine the exposure of a furnace tender to lead fume during his normal work duties which involves "furnace draws" and general activities around the furnace. Each draw lasts about 1.5 hr. These samples were collected at a flow rate of 3.5 LPM. The laboratory reported these lead masses on the samples for each draw: 1st draw: 12 ug: 2nd draw: 18 ug: 3rd draw: 25 ug. An 8 hour general room air sample collected at 1.9 LPM was found to contain 9.5 ug of lead. This worker spends 1.5 hours with each draw and the balance of his 8-hour day is spent watching the furnaces. Assume for the period of time he spends watching the furnaces, he has the same exposure as the general room air. You can be 95% confident that his true exposure for this day was between ug/m3 and ug/m3. At 95% confidence, would you conclude the exposure was in or out of compliance please show all your steps
The atomic mass of element X is 33.42 amu. A 21.83-g sample of X combines with 80.32 g of another element Y to form a compound XY. Calculate the atomic mass of Y.
If 29.1 mL of 0.4 M NaOH is used to reach the endpoint when titrating 20.1 mL of acetic acid, what is the concentration of the acetic acid in moles/L
Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug.
Balanced thermochemical equation and enthalpy diagram, The decomposition of zinc carbonate, ZnCO3(s), into zinc oxide, ZnO(s), and CO2(g) at a constant pressure requires the addition of 71.5kJ of heat per mole of ZnCO3.
A student found that a maximum of 0.800g silver acetate is able to dissolve in 100.0ml of water. What is the molar solubility and Ksp for the salt?
Calculate the probability of finding an electron that is described by this wavefunction in a volume of 1.0 pm3 (i) centred on the nucleus.
A synthetic organic chemist wants to make 100.0 grams of benzoyl chloride C7H5OCl from benzoic acid C7H6O2 in the following reaction.
when 1.0g of salicyclic acid is used with 2mL of acetic anhydride, which compound is the limiting reagent?
Draw the bondline structures of the isomers of this compound in the manner requested: Its diastereomer C, its optically active isomer D.
Calculate the mass of calcium carbonate formed when 25 mL of a solution of calcium chloride at 0.10 M react with sodium carbonate in excess
Calculate the theoretical yield of C_2H_5Cl when 127 g of C_2H_6 reacts with 250 g of Cl_2, assuming that C_2H_6 and Cl_2 react only to form C_2H_5Cl and HCl.
Calculate the final temperature of the solution has a specific heat capacity =4.18 J/°C · g. assuming no heat lost
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