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You wish to measure the iron content of the well water on the new property you are about to buy. You prepare a reference standard Fe3 solution with a concentration of 5.40 × 10-4 M. You treat 11.0 mL of this reference with HNO3 and excess KSCN to form a red complex, and dilute the reference to 50.0 mL. The diluted reference is placed in a cell with a 1.00-cm light path. You then take 10.0 mL of the well water, treat with HNO3 and excess KSCN, and dilute to 100.0 mL. This diluted sample is placed in a variable pathlength cell. The absorbance of the reference and the sample solutions match when the pathlength is 2.10 cm. What is the concentration of iron in the well water? For each solution, the zero is set with a blank.
what is the [Fe3+] in the well water
Compute the enthalpy change for the dissolution of ammonium nitrate express your answers in units of kJ/mol.
If 1.26 L of H2 gas are formed at STP, how many gram of HCl reacted? The reaction is Zn(s) + 2HCl(aq) ( H2(g) + ZnCl2 (aq)
Calculate the weight of benzene codistilled with each gram of water and the percentage composition of the vapor produced during steam distillation.
What volume of 0.200M Hydrochloric acid must combined to 250mL of 0.300M C8H7NaO3 to produce a buffer of solution with a pH of 3.37?
What would be an appropriate reaction mechanism for these two reactions? Including electron transfer arrows.
A quantity of 85.0 mL of 0.900 M HCl is mixed with 85.0 mL of 0.900 M KOH in a constant-pressure calorimeter that has a heat capacity of 325 J/°C. If the initial temperature of both solutions are the same at 18.24°C
For the saturated fatty acid palmitate, how many QH2, NADH, and acetyl-CoA molecules can be generated by complete ?-oxidation? How many total ATP can be produced from palmitate? If a single cis-double bond is added, how many total ATP can be made?
Determine the molar concentration of Na+ in a solution in which 6.315+/-0.004g of Na3PO4 has been added to 1000.0+/-0.4mL
what are the heats of formation of the following species.
Use the table of standard reduction potentials to calculate the equilibrium constant at a standard temperature (25 degrees C) for the following reactions:
Gold sells for $1120/oz. One ounce is equal to 28.35g. The molar mass of gold is 196.97g/mol. 1 moldovian franc contains 0.567g of gold. If 1 franc = $1.42, how many atoms of gold are presents in 0.010 moldovian francs?
An effective treatment for some cancerous tumors involve irradiation with "fast" neutrons. The neutrons from one treatment source have an average velocity of 3.3 x 10^7 m/s
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