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Preliminary analysis of a few soil samples from a parking lot with historical lead-gasoline spill and lead paint from the demolished buildings showed soil Pb concentrations between 60 and 700 mg/kg, and a standard deviation of 20.9 mg/kg. The number of samples required is _____ so that the estimated sample mean would be within ± 15 mg/kg of the population mean at 95% confidence level (Use trial-and-error to solve samplen).
Find the amount of heat involved when 300.4 g of propane is burned with an excess of oxygen. C3H8(g) + 3 O2(g) ? 3 CO2(g) + 4 H2O(l) -->?H = -2219 kJ
Based on your observations, what might have happened if you had not followed these instructions? Might this also have affected your percent yield? Explain.
If you start out with 2 fructose molecules how much net energy (in ATP's) can be produced in the muscles for all three processes (Glycolysis, Kreb Cycle, and electron transport chain)
1 mol of Ca(OH)2 is placed in 2 L of water and stirred. At equilibrium, at a certain temperature, 0.0180 mol of Ca(OH)2 dissolves. What is Keq
A radioactive sample contains 1.30g of an isotope with a half-life of 3.5 days. What mass of the isotope will remain after 5.6 days? (Assume no excretion of the nuclide from the body.)
calculate the mass of h2o produced when 12.0 g of glucose is combusted in a container of oxygen with a volume of 1.3 l
the density of carbon in the form of diamonds is 3.51 gcm3. if you have a 40-carat spherical diamond what is the
Use the cell potential for the Pb-PbI2 cell and the known [Pb2+] to calculate the [Pb2+] in equilibrium with PbI2.
Predict the common charges of the ions of tin. Explain your reasoning in terms of electron configuration. Also, predict the highest possible charge of a zirconium ion. Explain your reasoning in terms of electron configuration.
The vapor pressure of liquid chloroform, CHCl3, is 400.0 torr at 24.1°C and 100.0 torr at -6.3°C. What is Hvap of chloroform?
A solution containing potassium bromide is mixed with one containing lead acetate to form a solution that is 0.013M in KBr and 0.0035 M in Pb (C2H3O2)2.
Rank the following slightly insoluble compounds from the most soluble to the least soluble. CaCO3 Ksp = 2.8 x 10-9 Co(OH)2 Ksp = 1.6 x 10-15 CaF2 Ksp = 3.9 x 10-11 BaSO4 Ksp = 1.1 x 10-10
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