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Beer's law states A=ebc, which directly relates the concentration(c) of a sample, its molar absorptivity (e) and the absorbance(A) of a sample. Instead of bothering with a standard curve why not make two measurements: first, measure the A of a sample of known concentration in order to compute e. second, measure the absorbance of the solution with un-known concentration and use the e from the first calculation to calculate the concentration.
Would this be a better method than doing the standard curve with different measurements. Why or why not?
What volume in liters of O2(g) is required to form 46 L of CO2(g)? Assume both gases are measured under the same conditions.
Depict the resonance forms for a general carboxylate ion R-CO2 - showing all lone pair electrons for each resonance form as well as assigning formal charge(s).
An electron microscope employs a beam of electrons to obtain an image of an object. What energy must be imparted to each electron of the beam to obtain a wavelength of 10.0pm? Obtain the energy in electron volts (eV) (1eV= 1.602x10^-19J )
What error will this cause in their determination of the amount of iron in the table?
A 3 L vessel (1 L = 10-3 m3) contains 16 g of O2 gas at a pressure of 4atm.
a metal object with a mass 19 degrees celsius is heated to 96 degrees celcius, then transfered to a calorimeter containing 75 grams of water at 18 degrees celcius. the water and metal object reach a final temperature of 22 degrees celcius? what is..
What is the gauge pressure at a depth of 4.50 mi below the surface of the sea if thewater temperature averages 60°F? Give your answer in lb (force) per sq. in. The sp grof sea water at 60°F/60°F is 1.042 and is assumed to be independent of pressur..
Determine Kcat for a reaction in which Vmax is 8*10-3 mol/min as well as the reaction mixture contains two micrograms of enzyme molecular weight of the enzyme is 100000 D
Calculate the change in pH to 0.01 pH units caused by adding 10. mL of 2.72-M NaOH is added to 490. mL of each of the following solutions. a) water pH before mixing
The density of liquid octane, C8H18, is 0.7025 g/ml. If 1.00 mL of liquid octane is vaporized at 100 degrees Celsius and 725 torr, what volume does the vapor occupy?
Statements correctly describe(s) the relationship between the structure of a fatty acid and its melting point? a. Saturated fatty acids have melting points that increase gradually with molecular weight.
What must the units of k be? (C) Show that the intensity, |A (x)|^2 , of this travelling wave is nonzero everywhere, and independent of the coordinate x.
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