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An atomic adsorption method for determination of copper content in fuels yielded a pooled standard deviation of Spooled = 0.32 μg Cu/ml (s ---> σ). The analysis of oil from a reciprocation aircraft engine showed a copper content of 8.53 μg Cu/mL. Calculate the 90% and 99% confidence intervals of the results if it was based on (a) a single analysis, (b) the mean of four analyses, (c) the mean of 16 analyses.
At a particular temperature the equilibrium constant for the reaction: H2(g) + F2(g) ? 2HF(g) is K = 36.0. A reaction mixture in a 10.00-L flask contains 0.42 moles each of hydrogen and fluorine gases plus 0.15 moles of HF.
When the temperature is 100 °C, find the mole fraction of benzene in the vapor and liquid phases and the ratio of total moles in vapor to total moles in liquid.
a saturated solution contains 11.0 g NaBrO3 in 40.0 mL of water at 0 degree Celsius. What is the solubility in g solute/(100 g H2O)? Calculate the mole fraction at this temperature.
In a normal melting point, is the sample undergoing is chemical reaction or a change is intermolecular forces
What single reagent could you add that would allow you to differentiate between the members of each pair of solid compounds below? Tell what happens to each substance when the reagent is added and write a balanced net ionic equation wherever a rea..
One observation well is located 45 meters away and has a water surface that is 44.35 meters above the bottom of the aquifer. A second observation well is located 85 meters away and has a drawdown of 0.25 meters. What is the coefficient of permeabi..
Ksp for CaF2 is 3.9E-11 at 25C. Assuming CaF2 dissociates completely after desolving and that there are no other equilibria affecting its solubility calculate the solubility of Caf2 in grams per liter.
In an experiment, at this temperature, 1.10 mol of H2 and 1.10 mol of F2 are introduced into a 1.08-L flask and allowed to react. At equilibrium, all species remain in the gas phase.
Determine the pH of a solution that is 1.80% NaOH by mass. Assume that the solution has density of 1.01 g/ml.
A fossil was analyzed and determined to have a carbon-14 level that is 22.0% that of living organisms. How old is the fossil
An aqueous solution containing 10g of optically pure fructose was diluted to 500mL with water and placed in a polarimeter tube 20 cm long. The measured rotation was -5.20 degrees. Calculate the specific rotation of fructose.
Calculate the pH at the equivalence point if 25.00 mL of 0.010 M barbituric acid (HC4H3N2O3) is titrated with 0.20 M NaOH
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