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your are testing iron levels in multivitamins using spectrophotometry. the tablet your given has a mass of 10.0866 grams, and from this you took 8.0693 gram portion. This portion is dissolved in acidic media before diluting to 250.0mL in distilled water. from this you take a 1.00mL aliquot and dilute this to 200.0mL in distilled water. the sample is analyzed by the spectrophotometer, and gives you the absorbance reading of .422. A solvent blank gives a reading of .002. the blank corrected standard curve has the equation 'y=5.726 x 10^-3x', where the x-axis scale is in micrograms of Fe.... from this information, find the original amount of iron (in milligrams) in the tablet.
Describe the effect on pH (increase, decrease, or no change) that results from each of the following additions: (a) potassium acetate to an acetic acid solution,
a balloon is filled with helium to a volume of 25 l at 100kpa pressure and 25degc. the balloon is then released. what
Write the net ionic equation for this reac- tion occuring in water: Calcium sulfide and iron(II) bromide are mixed to form iron(II) sulfide and calcium bromide.
how many valence electrons do each of the following elements have, and what are the specific valence electrons for each element
when measured in aa quartz cuvett of 1cm path length. What is the concentration of DNA in µg/mL?
Zinc sulfide reacts with nitric acid to give zinc sulfate and nitric oxide. Calculate the mass of zinc required to react with 110 mL of 0.15 M nitric acid.
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition
An aerosol spray can of deodorant with a volume of 350 mL contains 3.0 g of propane gas C3H8 as propellant.
How much energy would be required to melt 48 g of HCl at its melting point of -110.8C? Hfus for HCl is 14.2 cal/g and Hvap for HCl is 98.7 cal/g.
A current of 5.07 A is passed through a Sn(NO3)2 solution for 1.20 hours. How much tin is plated out of the solution
Calculate the wavelength of light necessary to provide photons of this energy? C) Explain why this film can be handled in a darkroom under red light.
How would the presence of a double or triple bond help to determine the geometric shape of a molecule?
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