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Mn was used as an internal standard for measuring Fe by atomic absorption spectroscopy. A standard mixture containing 2.00 ppm and 2.50 ppm gave a Fe / Mn signal ratio (quotient) of 1.05. A 5.00 mL unknown Fe solution was mixed with 1.00 mL solution containing 12.5 ppm Mn. The absorbance of this mixture at the Mn wavelength was 0.128 and the absorbance at the Fe wavelength was 0.128. Find the concentration of the unknown Fe solution. (Note: In AAS each element is detected at its specific absorption wavelength)
Technetium-99 is a long-live radioactive isotope of technetium. Each nucleus decays by emitting one beta particle. What is the product nucleus?
draw a lewis structure for one important resonance form of HAsO4 2-. In clude lone pair electrons and indicate nonzero formal charges
Determine the concentrations of Ag+ and C2O4- in a saturated aqueous solution of Ag2C2O4. Ksp = 3.5 x 10-11
A container consists of CO2 gas at a temperature of 15 C and at a pressure of .990 atmospheres. The volume of the container is 500 mL. How many grams of CO2 would be in the container? (1 liter equals 1000 milliliters.)
What volume of a concentrated { HCl} solution, which is 36.0% { HCl} by mass and has a density of 1.179 {g/mL}, should be used to make 5.30L of an {HCl} solution with a {pH} of 1.7.
If a segment of DNA consists of 5'-TCTAGC-3', the nucleotide order in the complementary mRNA strand (written in 5' to 3') would be:
What are the Distillation ranges and Retention times of Acetone, 2-butatnone, 2-pentanone, and 2-hexanone
The foul air power and light company has been ordered to remove sulfur dioxide from its smoke stacks. Management decides to pass the gas over solid calcium oxide thereby forming solid calcium sulfite.
A 235mL solution is prepared with 41.8 millimoles of an unknown sodium salt of a deprotonated organic acid (NaX). If the solution has a pH of 8.05, what is the pKa of the acid?
the ionization of water must be considered in order to calculate the pH of this acidic solution.)
when a glass rod is rubbed with a silk cloth charges appear on both. a similar phenomenon is observed with many other
Compare the program model predicted direction of the dipole moment of NH3 with the predicted direction of the dipole moment in PCl3. Are they the same direction. Why or why not
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