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Problem- A standard solution containing 2.00 mg/L of vitamin E fluoresces with 374 units. A sample solution of vitamin E fluoresces with 643 units. The sample solution is spiked with 4.00 mg/L of vitamin E and the resulting is spiked with 4.00 mg/L of vitamin E and the resulting mixture fluoresces with 1092 units.
1- What's the concentration of vitamin E in the sample as determinded by standard addition?
2- Was the standard addition procedure needed?
I require skilled aid to answer the given problem
Boron has two stable isotopes 10B (mass = 10.012938) and 11B (mass = 11.009305). If the atomic weight of Boron is 10.811 Explain what are the isotopic abundances of each isotope
Calculate pCu at the equivalence point in the titration of 20.0 mL of 0.0161 M CuSO4 with 0.0100 M EDTA at pH 8.00.
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If it takes 526 J of energy to warm 7.40 grams of water by 17 degrees Celsius, how much energy would be needed to warm 7.40 grams of water by 55 degrees Celsius?
which equation best describes the average rate for the reaction shown. A (aq) + B 9aq) -----> C (aq) + D (aq) A. rate= [C] [D] / [A] [B] B. rate= - deltat/-deltaB C. rate= -delta[C]/delta t D. rate= -delta[A]/delta t E. rate= [A] [B]/ [C] [D]
how many grams of sucrose, c12h22o11, must be dissolved in 750 ml of water to prepare a 0.250 molal solution?
Problem- Consider both isomers of a quare planar dicarbony complex (cis and trans). determine the point group of both and the reducible representations for each isomer. then determine which of the CO stretches are IR active in both complexes
The Haber-Bosch process is a very important industrial process. In the Haber-Bosch process, hydrogen gas reacts with nitrogen gas to produce ammonia according to the equation 3H2(g)+N2(g)--->2NH3(g)
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