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An oil storage area abandoned 19 yrs ago had oil spilled on the ground and saturated the soil at a concentration of 400mg/kg of soil. A recent soil sample shows a concentration of 20mg/kg. A man says that the oil was reduced at a rate of 20mg/kg each year and in one year will be free of contamination. Is this a good assumption?
a particular substance absorbs very strongly at 620 nm. at a concentration of 0.100 m this substance has an absorbance
Which of the following species is present in the greatest concentration in a 0.100 M H2SO4 solution in H2O
How many mL of a .1 N solution of NaOH must be added to a 25 mL solution of .1 N HAc to obtain a pH of 9.75? What is the concentration of HAc at this pH
a solution of 100 ml of .200 M KOH is mixed with a solution of 200 ml of .150 M NiSO4. what is the chemical equation, what precipitate forms, what is the limiting reagent, and how many grams of the precipitate form?
Explain which of the following choices are conjugate acid-base pairs and will produce a buffer solution. Please explain your reasoning. There may be more than one correct choice.
Calculate the maximum number of moles and grams of H2S that can form when 195 g aluminum sulfide reacts with 106 g water.
When 123.8 g of ethylene (C2H4) burns in oxygen to give carbon dioxide and water, how many grams of CO2 are formed
What is the molarityof a NaOH solution if 15.5 mL of a 0.220 M H2SO4 solution is required to neutralize a 25.0 mL sample of the NaOH solution?
A stock aqueous solution contains 503.29 grams of NaCl per 1.000 liter. 81.00mLs of water is added to 10.00mLs of the stock solution. Explain what is the morality of the dilution
A large pond is 300m by 95m with an average depth of 2.5m. Assuming that the pond is saturated with oxygen, calculate the amount of sugar (C12H22O11) in kg that would be sufficient to completely consume the dissolved oxygen.
How would you describe the scope of your risk assessment project
A 363 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 636 mmHg. Calculate the moles of Ar present.
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