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What is the volume of chloroform required to decrease the concentration of polyaromatic hydrocarbon in water (50 mL) at 10 µg/L concentration level at the optimum experimental conditions to 0.05 10 ng/ mL assuming D = 120. What the extraction percentage will be if the volume of the organic solvent is tripled. Would you please comment in your data.
Experiments have shown that the average frequency of chirping by a snowy tree cricket depends on temperature as shown below. Chirping Rate Temperature
Complete and Balance the following redox equation. MnO4 + H +Br-->Mn2 +Br2 +H2O (acidic Solution). The sum of the smallest whole number coefficients is
What is the difference between energy and power? What is a unit of power? How does speed relate to power?
How does the system in equilibirium seem to respond to the changes applied to it with respect to the distribution of iodine?
Describe the bonding in NCl- using a molecular orbital description. Assume the molecular orbital levels are ordered as in N2. What is the NCl- bond order? How any unpaired electrons are present?
Experiment you measured teh effect of changing temperature on the pressure of a conatined gas at constant volume.
calculate the values of ?Ho, ?So, and ?Go for the reaction at a pressure of 1 atm and temperature of 298.15 K. C(graphite) + H2O(g) = CO(g) + H2(g)
Consider an element Z that has two naturally occurring isotopes with the folowing percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.05 abundant. What is the average atomic ma..
Determine the molarity of a solution prepared by dissolving 4.50 mol of NH4Cl in sufficient water to make 2.00 L of solution.
A test solution contained 2 mL of 0.10 M Ag+. A silver strip was dipped into the test solution, and a cell potential of 0.0592 V was measured against an Ag/Ag+(1.0M) reference half-cell.
If 2.31 grams of the vapor of a volatile liquid is able to fill a 498 mL flask at 100 degrees Celsius and 775 mmHg, what is the molecular weight of the liquid. What is the density of the vapor under these conditions
What volume will 500 mL of gas at 20°C and a pressure of 420 mm Hg occupy if the temperature is reduced to -80°C and the pressure is increased to 650 mm Hg?
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