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A worker is exposed to 10 ppm of toluene for 1 hour, to 50 ppm for 1 hour and to 2 ppm for the remainder of the 8-hour shift. What is the TWA exposure?
A. 3
B. 12
C. 9
D. 8
Chemistry, Academics
2K3PO4(aq)+3MgCl2(aq) → Mg3(PO4)2(s)+6KCl(aq) The molecular equation you determined in Part B is shown above for your convenience. Examine each of the chemical species involved to determine the ions that would be present ...
Calculate the number of moles of barium chloride in 427g of a 3.17% by mass barium chloride solution?
A Chem major obtains a high-paying summer job and is given the task of determining the ethanol content (in vol %) of a commercial mouthwash sample. she decides to use gas chromatography because the experiment was so much ...
Does dissolved solids such as sugar and salt modify/change the boiling point of water; do mixtures have the same boiling point as pure substances?
Magnesium metal(0.100 mol) and a volume of aqueous hydrochloric acid that contains0.500 mol of HCl are combined and react to completion. How manyliters of hydrogen gas, measured at STP, are produced? Mg(s) + 2HCl(aq) --- ...
PROTEIN FOLDING ASSIGNMENT In an "in vitro" protein folding experiment monitored by fluorescence measurements the following data was obtained for protein X: [GuHCl], M Wavelength Maxima, nm 0 330 0.5 332 1.0 331 1.5 332 ...
What was the initial energy level of an electron if it was excited by a photon of wavelength 38.9µm and jumped to an energy level of 10?
A chemist adds 75.0 mL of a 1.92 M nickel(II) chloride (NiCl2) solution to a reaction flask. Calculate the millimoles of nickel(II) chloride the chemist has added to the flask. Round your answer to 3 significant digits.
It takes 37.8 mL of 0.2114 M NaOH to neutralize 19.3 mL of an oxalic acid solution with an unknown concentration. Calculate the actual concentration of this oxalic acid solution. Don't forget to look at the balanced equa ...
Q1. Sodium metal is very active with water. Therefore, determining the value of a block of sodium will be impossible by water displacement. On the other hand, the density of sodium metal can be found in the chemistry han ...
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
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