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A mixture containing 80.0 nM iodoacetone (designated A) and 64.0 nM p-dichlorobenzene (designated B) gave the relative detector response (peak area of A)/(peak area of B) = 0.71 in a chromatography experiment. A solution containing an unknown quantity of A plus 930 nM B gave a relative detector response (peak area of A)/(peak area of B) =1.21. Find the concentration of A in the unknown.
Given the following reaction. (Equation not balanced.) ZnS + O2 ? ZnO + SO2 How many grams of SO2 can be made from the reaction of 18.5 grams of O2 with excess ZnS
Orange juice is an aqueous solution that derives much of it's acidity from citric acid. There are variations in the acidity of each brand depending on many factors. Use the data below from an acid-base titration
Find the energy of a photon of light if the wavelength of the light wave is 6.88 x 10-7 m.
A solution of 75.0 of benzene and 75.0 of toluene has a total vapor pressure of 80.9 at 303 . Another solution of 100.0 benzene and 50.0 toluene has a total vapor pressure of 93.9 at this temperature.
Hydrocarbon mixtures are used as fuels. What mass of CO2 gas is produced by the combustion of 189.2 g of a mixture that is 57.6 % CH4 and 42.4% C3H8 by mass
the enthalpy of vaporization of ethanol i 43.5 kj/mole at its normal boiling point of 352 k. using avalue of the molar heat capacity of liquid ethanol of 111.46 j/k/mol
KRB pelle technique, solvents, mulls, thin film plate technique. which one of the following methods is better
At the begining of the titration being performed in this lab experiement, how do you determine how much naoh should be added at each interval between volume-pH readings? As you approach the equivalence point,
How many moles of Fe would be formed from 50 grams of Fe3O4 in the following equation
A solution is prepared by dissolving 5.32 grams of potassium nitrite (a food preservative, as Clark Griswold would explain) into about100 ml of DI water in a volumetric flask. Enough water is then added to give a total volume of 250.0 ml. What are..
In a titration, 25.0 mL of 0.154 M HCl was added to 45.0 mL of 0.213 M ammonia (NH3). What is the pH at this point? (Kb of NH3 = 1.8 × 10-5 )
When heat is added to a solution of CoCl2 and HCl in water, what happens on the molecular level that causes the reaction to shift?
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