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Toxicologists use the term LD50to describe the number of grams of a substance per kilogram of body weight that is a lethal dose for 50 percent of test animals. Calculate the number of arsenic(VI) oxide molecules corresponding to an LD50value of 0.015 for a 184-lb man, assuming that the test animals and humans have the same LD50.
If air is drawn into the pump at a pressure of 0.97 atm during the upstroke, how long must the downstroke be, in centimeters, to raise the pressure of the air to 5.40 atm (approximately the pressure in the tire of a 10-speed bike). Assume no chang..
calculate the heat evolved by burning one mole of a c20h40 if a 0.50 gram samplecauses the temperature of 2.50 kg of
Phenol is a common organic compound that may be used as a disinfectant. Its pKa in water is 10.0 while in methanol its pKa = 14.4. Is it a stronger acid in water or methanol? Explain the difference in the pKa for phenol in the different solvents.
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 3.80 g of sodium carbonate is mixed with one containing 5.43 of silver nitrate.
As per to the law of gravitation there would still be a tiny attraction between them. Compute the energy to remove the orbiting particle into infinity ionization energy. Leaved the final answer in Joules.
Write a balanced equation for the reaction of N2 (g) with H2 (g) to produce gaseous ammonia. Determine whether the reaction will be reactant or product favored.
A copper refinery produces a copper ingot weighting 150 lb. If the copper is depicting into a wire whose diameter is 8.25mm, explain how many feet of copper can be obtained from the ingot. The density of copper is 8.94 g/cm^3
Calculate the change in enthalpy of Hydrogenation from 298 K to 398 K. The Cp values are C2H4: 43.6 J/K mol and C2H6: 52.7 J/K mol
What is the wavelength, in nanometers, of the light emitted when the electron in a hydrogen atom drops from the energy level n_i = 12 to n_f = 5
The molality of sodium nitrate solution us 1.44m. What is mole fraction of NaNo3. The molar mass of NaNo3 is 85.06g/mol
some species below react with fe2+ and some do not. for each that does write the equation with products for those that don't write no reaction -na (s) -na+ (aq) -co (s) -co2+ (aq) -h+ (aq)
Problem- Be specific, using appropriate terminolgies to explain, on a molecular level, how soaps accomplish cleaning in aqueous solution.
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