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The Quinine in a 1.664 g. antimalerial tablet was dissolved in sufficient 0.1 M HCl to give 500 mL of solution. A 20.00-mL aliquot was then diluted to 100.0 mL with the acid. The fluorescence intensity for the diluted sample at 347.5 nm offers a reading of 245 on an arbitrary scale. A standard 100-ppm quinine solution registered 125 when measured under conditions identical to those for the diluted sample. Compute the mass in milligrams of quinine in the tablet.
Calculate the change in energy deltaE that occurs when 0.5L of liquid water is vaporized
what is the density of a block of marble that occupies 350 cm3 and has a mass of 660 g?answer in units of
On a IR Spectrum chart, where would the one or two absorptions be located that distinguish the compound Diethl Ether
To make strawberry jam, crushed strawberries and sugar are mixed in a 45:55 mass ratio, and the mixture is heated to evaporate water until the residue contains one-third water by mass. Calculate how many pounds of strawberries are needed to make a..
design a molecule with three chiral centers and draw eight possible stereoisomers of the molecule.
Based on the Henderson-Hassalbach equation how many mmols of Tris-HCl are there in a 100 mL of a 100 mM Tris-HCl buffer solution at pH 8.1? Note that the 100 mM refers to the sum of Tris and Tris-HCl concentrations. Answer in mmols
A 25.00-mL sample of well water containing dissolved iron was treated with hydroxylamine hydrochloride, pH 5 buffer, and 1,10-phenanthroline, and diluted to 100.0 mL. Absorbances were measured at 510 nm using a 1.00-cm cell.
When nitroglycerin explodes it produces nitrogen, oxygen and water and carbon dioxide. If the heat of reaction is -5692 kj/mol how much heats released when 4.5 g of the explosive reacts
A 135.0 L weather balloon filled with 4.9 moles of helium has a small leak. If the helium leaks at a rate of exactly 10mmol/hr what is the volume of the balloon after 72 hours
Suppose the maxium pressure the vessel can safely with stand id 1.60 atm. what is the maxium temperature in K the gas can have before its pressue might burst the vessel
The student uses 19.5 mL of 0.535 M NaOH to titrate the solution. Calculate the moles of acid neutralized per grams of tablet.
What is the equilibrium constant expression for the following reaction- Pb2+(aq) + 2I?(aq)?PbI2(s) Choose from the list below and enter the letters alphabetical order.
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