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The insecticide DDT has a half-life in the human body of about 7 years. That is, in 7 years its concentration.( Although DDT is no longer in use in the United States). It was estimated that 25 years ago the average farm worker had a body DDT concentration of 22 ppm (parts per million by weight). Estimate what the farm worker's present concentration would be?
Assuming all gases are at the same pressure and temperature, how many liters of CO2 are formed from 15.0L of CO.
Determine which flask has the smallest amount of water vapour and which one has greater vapor pressure of H 2 O?
Compute the volume of the tank if this tank has 115 moles of neon gas and has a pressure of 57 atm at a temperature of 45 0C.
Identify the nuclide produced when americium-241 decays by alpha emission, 241 / 95 Am→ 4 / 2 He + ? Express your answer as an isotope using prescripts.
Compute the number of moles of Chlorine atoms in 3.01×10^24 formula units of magnesium chloride,MgCl2 .
What is the geometry and hybridization of the carbonyl carbon in carboxylic acids and their derivatives.
138g of K and 448g of I react completely to form KI. What mass of KI would have been produced if 138g of potassium and 41g of iodine has been used?
A mixture of helium and neon gases is collected over water at 28.0 C and 745 mmHg. if the partial pressure of helium is 368 mmHg, what is the partial pressure of neon?
The temperature of the H 2 O is 26.55 degree celsius. Determine how much heat is evolved per gram of fuel burned?
A container (8.65-L ) holds two gases mixture at 31 °C. The partial pressures of gas X and gas Y, respectively, are 0.206 atm and 0.867 atm. If 0.200 mol a third gas is added with no change in temperature or volume determine the total pressure be..
Determine how many grams will remain in 150 Years If we have 150.000 g of 137Ce now,?
Assume that 120 grams of CH 3CH 2OH at 29 degree Celsius temperature is added with 250 grams of CH 3CH 2OH at 85 degree Celsius degree Celsius at constant pressure of atmosphere.
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