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DDT (molar mass= 354.49 g/mol) was a widely used insecticide that was banned from use in the United States in 1973. This ban was brought about due to the persistence of DDT in many different ecosystems, leading to high accumulations of the substance in many birds of prey. The insecticide was shown to cause a thinning of egg shells, pushing many birds toward extinction. If a 20-L drum of DDT was spilled into a pond, resulting in a DDT concentration of 8.75X 10^-5 M, how long would it take for the levels of DDT to reach a concentration of 1.41X10^-7 M (a level that is generally assumed safe in mammals)? Assume the decomposition of DDT is a first order process with a half-life of 56.0 days.
Draw the molecular-orbital-energy level diagram for the SO molecule and the NF molecule
what mass of Na2CO3 will be required to titrate 75.0 mL of 0.350 M HCl. This is the balanced equation given Na2CO3+2HCl--->2NaCl +H2O+CO2
An element has a half life of I month. Given 1000 radioactive atoms, how many radioactive elements will remain after 3 months?
calculate the equilibrium constant ka for the ionization of formic acid in aqueous solution at 25 degrees celsius.
lemon juice is a complex aqueous solution that does not freeze in ahome freezer at temperatures as low as -11 degc. at
a 1.26-g sample of an enzyme is used to make a 7.30-ml solution. what is the molar mass of the enzyme if the osmotic
Proceeds at a certain temperature until the partial pressures of H2O, H2, and O2 reach 0.065 atm, 0.0070 atm, and 0.0040 atm respectively. What is the value of the equilibrium constant at this temperature
If a raindrop weighs 56 mg on average and 5.1 multiplied by 105 raindrops fall on a lawn every minute, what mass (in kg) of rain falls on the lawn in 4.0 h?
If 4.5 of ammonium chloride were dissolved in 200 L of water what would be the ammonium chloride concentration in mg/L
Which halide has he lowest boiling point? Explain your choices. (CH3)2CH2Br vs CH3CH2CH2Br c. Which is a better nucleophile? Explain our choice.
how much heat is required to convert 30.0 g of ethanol at 28 c to the vapor phase at 78 c ?additional infoethanol
Using the volumes of sodium thiosulfate solution you just entered and the molarity of the potassium iodate primary standard solution, calculate the molarity of the sodium thiosulfate secondary standard solution for each trial.
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