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A biochemist studying the break down of insecticide DDT finds that it decomposes by a first-order reaction w/ a half-life of 12 years. How long does it take DDT in the soil sample to decompose from 2.40 x10^2ppbm to 10. ppbm (parts per billion by mass)
if a 1.00 g piece of gold (density = 19.32 g/cm^3) is hammered into a sheet 8.0 x 5.0 ft what is the average thickness of the sheet in meters?
250 milligrams of butyric acid (CH3CH2CH2COOH) and 5 mL of ethanol (CH3CH2OH) were combined with conc sulfuric acid. What is the theoretical yield (in milligrams) of the ester product (CH3CH2CH2COOCH2CH3)?
The molecular weight of the protein is 3.4e4 grams per mole. What is the molar concentration of the protein?
A reaction has a rate constant of 0.00704 sec-1, how long will it take (in minutes) until 0.212 mol/L of the compound is left, if there was 0.619 mol/L at the start
The addition of bromine to ethene in the presence of high concentration of chloride ion in an inert solvent results in the formation of 1,2-dibromoethane and 1-bromo-2-chloroethane. No 1,2-dichloroethane is obtained
A Solution of 1.69g of this compound in 9.23g of benzene freezes at 2.18 degree celsius. What are the molecular formula and molar mass of the compound? ( the normal freezing point of pure benzene is 5.50 degree celsius)
What mass of Al in grams is deposited at an electrode is a current of 1.22 amperes is passed for 12.0 hours through a solution of Al(NO3)3
the pressure of a sample of gas at 10.0 c increases from 700. mm hg to 900. mm hg. what is the new
what is the balanced chemical reaction describing the decomposition of ammonium nitrate, and calculate the standard heat of reaction using the appropriate enthalpies of formation
Styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperature in the presence of superheated steam. A.) Given the following data, what is the delta Hrxn, delta Grxn and delta Srxn at 298 K.
a steel reaction vessel has a movable piston that is set to allow an enclosed sample of gas expandnbspand contract
What is the heat change per mole of CaCl2 dissolved in water? Assume that all the heat is absorbed by the water. (c = 4.18 J/g C)
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