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You are a member of EPA enforcement team investigating the possible ongoing dumping of arsenic in Cavalier Lake. You take water samples from the middle of the lake and find that the concentration is 89.6 ppb. 10 days later you take another sample and find it is 81.9 ppb. Convinced now of the problem, you make discrete inquires at a company situated on the lake and employee confesses to you that they have been dumping 89 g/min for years but that the dumping has now stopped. If lake has a residence time of 100 days, the flowrate into the lake is 10 m3/s, the surface area of the lake is 107m2, and the rate of evaporation out from the lake is 6 cm/wk, how long ago from the second sampling time did the dumping stop?
HCL acid solution is standardized using 0.502g of sodium carbonate. Find the molarity of the acid if 30.5mL are required for the titration.
An oxide of phosphorus contains 56.4% oxygen and has a molar mass of 284 g/mol. What is the molecular formula for this compound?
Consider a lake containing 39 ppb (parts per billion) of parathion, which has a log Kow = 3.8. If a sample of lake water was mixed with octanol, what is the expected concentration of parathion in the octanol?
How much energy is required to vaporize 98.6 g of ethanol (C2H5OH) at its boiling point, if its ΔHvap is 40.5 kJ/mol?
If 69.5 kJ of heat is applied to a 1025 g block of metal, the temperature of the metal increases by 11.4°C. Calculate the specific heat capacity of the metal in J/g°C.
20 ml Calcium Hydroxide solution was titrated with 9.8 ml 0.0105 M HCl in according to reaction: Ca(OH)2 + 2HCl ? CaCl2 + 2H2O What is the Molarity of Ca(OH)2 in the solution
How much energy (in kilojoules) is required to convert 270 mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL?
Determine the rate law and the value of k for the reaction at 25oC
Nitrogen monoxide is produced by combustion in an automobile engine. According to the following reaction, how many moles of oxygen gas are necessary to form 0.285 moles nitrogen dioxide
Someday, cars may be powered by clean H2/O2 fuel cells and electric motors. Under standard conditions, such a fuel cell can develop 1.229 volts. If the oxygen is obtained from air (at P=0.21 bar), what pressure of H2 would be required to develop 1..
During an extraction a student loses track of which layer is the organic layer. How could she determine which layer is the aqueous phase?
What concentration of this base will produce a pH of 10.13?
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