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A two-tablet sample of a vitamin/mineral supplement weighing 6.08 g was wet-ashed to eliminate organic matter, complexed with a highly colored ligand, and then diluted to 1.00 L volume. Two 10.00 mL aliquots were then analyzed. Calculte the average weight of iron in each tablet, based on the following information:
[Reagent Volume, mL] [Absorbance]
Fe(III), 1.00ppm Ligand H2O
0.00 25.00 15.00 0.492
15.00 25.00 0.00 0.571
Give the structure of a hydrocarbon that has six carbon atoms and three vinylic hydrogens and two allylic hydrogens
The Nernst equation is used to predict the impact of concentration on the cell potential. What value of slope does the Nernst equation predict for a plot of Ecell vs log(Cu2+ Conc. Ratio)
What is a zymogen? Is it used over and over like other enzymes? And what is the physiological advantage
A gas pressure of 2.0 atm is in a closed container. Indicate the changes in its volume when the pressure undergoes the following changes at constant temperature: a) the pressure increases to 6.0 atm. b) the pressure drops to 1.0 atm. c) the pressu..
consider a major oil spill in a lake ( a prototype situation related to Alaska Oil Spill few years ago and many subsequent spills) Amount of oil spilled is 2.9 mega gram (Mg).
You use 27.5 mL of NaOH to titrate 100.0 mL of HCl and 18.4 mL of NaOH to titrate 50.0 mL of 0.0782 M H2SO4. What are the concentrations of the HCl and NaOH respectively?
The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of the non-volatile solute in the solution?
Which statement best describes relationships in a modern periodic table? A.) Each transition element is placed in the column of the main group element that it most closely resembles.
Given the information given below, what is the standard enthalpy change for the reaction: W(s) + 3H2O(g) => WO3(s) + 3H2(g)? 2W(s) + 3O2(g) => 2WO3(s) ?Ho = -1685.4 kJ 2H2(g) + O2(g) => 2H2O(g) ?Ho = -477.84 kJ
Based on the sign of E°cell, classify these reactions as spontaneous or nonspontaneous as written. Assume standard conditions. Al3+(aq) + 3Na(s) ---->Al(s) +3Na+(aq) 3Fe2+(aq)+2Cr(s)---->3Fe(s)+2Cr3+(aq) Zn2+(aq) + Sn(s)---->Zn(s) + Sn2+(aq)
Calculate the delta Hrxn for the following equation- 4KNO3(s) - - > 2K2O(s) + 2N2(g) + 5O2(g)
The flame in a torch used to cut metal is produced by burning acetylene (C2H2) in pure oxygen. Assuming the cumbustion of 1 mole of acetylene released 1251 kJ of energy
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