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TWA = CaTa + CbTb + ... + CnTn 8 TWA = Time-Weighted Average Ca = Concentration of contaminant during the sampling period "a" Ta = Time of sampling period "a" Cb = Concentration of contaminant during the sampling period "b" Tb = Time of sampling period "b" Cn = Concentration of contaminant during the sampling period "n", where "n" is the last of a series of contaminants Tn = Time of sampling period "n" Note: All concentrations are in parts contaminant per million parts of air or milligrams of contaminant per cubic meter of air. Air Sampling Problem: You are an industrial hygienist that is conducting personal sampling on a worker who is overseeing a production process involving use of toluene (Note: The Occupational Safety and Health Administration has established a Permissible Exposure Limit of 200 parts per million (ppm)). You are able to measure the following exposures: 500 ppm for 1 hour 100 ppm for 4 hours 225 ppm for 3 hours
Enough of a monoprotic acid is dissolved in water to produce a 0.0197 M solution. The PH of the resulting solution is 6.41. Calculate the Ka for the acid.
If one component of a solution follows Raoult's Law subsequently the other component must also obey the same law. Intermolecular forces are small in ideal solutions.
A hypothetical compound has a formula X4YZ5. if the atomic masses of X, Y, and Z are 165.3amu, 75.5amu and 37.2 amu. Calculate the % composition by mass of the compound
the space shuttle orbiter utilizes the oxidation of methyl hydrazine by dinitrogen tetroxide for propulsion.4 n2h3ch3l
Calculate the mass of propylene glycolC3H8O2 that must be added to 0.320kg of water to reduce the vapor pressure by 2.88torr at 40C Pressure H2O 40C 55.3torr
A real gas behaves more like an ideal gas at high pressures and low temperatures. 4. The individual gas particles are not attracted to one another.
Calculate the amount of heat energy in joules required to heat 50.0g of each substance from 25.0 c to 37.0 c
Problem- what would happen if the ester we made (isopentyl acetate) were to be heated with a large volume of ethanol containing some sulfuric acid
calculate the molar mass of naphthalene given that a solution of 2.11g of naphthalene in 100g of benzene has a
If a reaction mixture initially contains 0.159 M SO2Cl2 , what is the equilibrium concentration of Cl2 at 227 C?
A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 degrees C. The initial concentrations of Pb2+ and Cu2+ are 5.00×10^?2 M and 1.50 M , respectively.
a mixture of p-nitrophenol and o-nitrophenol can be separated by steam distillation. the o-nitrophenol is steam
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