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It is desired to determine the micrograms of thiamine, Vitamin B, per gram of portk. A 2.00 gram sample of pork was extracted with HCl, treated with phosphatase, and diluted to 100mL. An aliquot of 15 mL is purified by absorption and elution, during which process it is diluted to 25.0 mL. Of this, two 5-mL portions are taken, one of them is treated with Fe(CN)6 ^3- and both are made up to 10.0 mL for fluorometric examination. A standard solution of thaimine containing 0.2 micrograms per mL is subjected to similar treatment, except that the portion introduced into the adsorption column is made up to its original volume after elution. Two 5 mL aliquots are taken, one is oxidized, and both are made up to a final volume of 10.0 mL for measurement by fluorescence. The following data was recorded. Solution: Relative Fluorescence A (standard oxidized) 62.4 B (standard, blank) 7.0 C (sample, oxidized) 52.0 D( sample, blank) 8.0 Calculate the vitamin B1 content of the pork in terms of micrograms per gram.
The decomposition of hydrogen peroxide is first order in H2O2. 2H2O2 -----> 2H2O + O2 The rate constant for this reaction at 20 C is 1.8 * 10^-5 s^-1
Determine the equilibrium total pressure in a closed reaction flask if 0.040 mol of NO and 0.020 mol of O2 were placed in the evacuated reaction flask and heated to 100°C, resulting in a 75%-yield of NO2.
evaluate its purity and to determine whether it might be identical to a given sample of an illegal drug, a white crystalline solid. Clearly explain what you would do, why you would do it, and how you interpret your results
A flask contains 0.180 of liquid bromine br2, . Determine the number of bromine molecules present in the flask.
Label the anode, cathode and direction of e- flow an write the half reaction equation for each electrode
The decomposition of nitrogen dioxide is a second-order reaction. At 550 K, a 0.250 M sample decomposes at the rate of 1.17 mol/Lxmin a). Write the rate expression?
The ionization constant Ka of benzoic acid is 6.3x10^-5. calculate th equilibrium concentrations of H+, benzote anion and benzoic acid. The initial concentration of benzoic acid is .10 M.
Give a brief discussion of the chemistry of Diels-Alder reactions and why do ENDO products usually predominate
Write a balanced equation for each of the two steps of the reaction, namely: (1) the reaction between benzyltriphenylphosphonium chloride and sodium hydroxide
How long does it take to deposit a coating of gold 1.00um thick on a disk-shaped medallion 4.00 cm in diameter and 2.00 mm thick at constant current of 89 A?
Recall "living" carbon samples show 15.3 d/min*g (carbon). note: CaCO3 is 12.00% carbon, and 14C has a half-life of 5730yr.
How many of each type of atom are there in a cubic crystal with an edge length of 4nm?
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