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Allocated volumes were: 8.00mL NaSCN solution and 12.00mL of the iron (III) nitrate solution. On the chemical records it was indicated that the concentration of the NaSCN solution is 1.98×10-3 , the Fe(NO3)3 solution is 8.10×10-4 mol/L and of the nitric acid 0.10 mol/L. While the reaction reached equilibrium, the absorbance measured at 447 nm was equal to 0.341. The path length of the cuvette utilized in the experiment was 1.00cm, and the extinction coefficient (?) of the FeSCN2+ complex at 447 nm is 4400 L mol-1 cm-1.
Explain what is the value of the equilibrium constant of the reaction? The table below can assist to organize data and solve the problem.
Fe3+ + SCN----- > FeSCN2+
I (moles)R (moles)E (moles)Ceq (concentrationsAt equilibrium)
Disulfur dichloride is produced by reacting chlorine gas with molten sulfur. What is the percent yield if 3.25 g S2Cl2 is isolated from the reaction of 5.0 g S8 and 3.75 g Cl2
if instead of using the blue dye we had used a red dye what changes would you make in your experimental procedure to
The vapor pressure of dichloromethane,CH_2CL_2,at 0 degree C is 134mmHg. The normal boiling point of dichloromethane is 40 degree C. Calculate molar heat of vaporation.
How long would it take for 1.50 of water at 100.0 to be converted completely into steam if heat were added at a constant rate of 16.0
What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with Ka=3.5x10^-8. The equation for the dissociation of hypochlorous acid is: HOCl(aq)+H2O>>>H3O+(aq) + OCL-(aq)
when 100 ml of an aqueous solution containing 1.0 g of caffeine is extracted with 10 ml of chloroform at room
Two molecules are mirror images of one another, and they are not superimposable. What is the relationship between them? If two other molecules are mirror images of one another, and they are superimposable, then what is the relationship between them
Suppose that the microwave radiation has a wavelength of 10.7 cm. How many photons are required to heat 200. mL of coffee from 25°C to 65°C?
With regards to a bromination of cis-stilbene which produces two enantiomers (S, S and R, R), what can be done experimentally to confirm that the predicted products were obtained
Suppose that the microwave radiation has a wavelength of 10.8cm . How many photons are required to heat 295mL of coffee from 25.0 ^\circ \rm C to 62.0 ^\circ \rm C
Calculate the molarity and mole fraction of acetone in a 1.82 molality solution of acetone in ethanol. Density of acetone is .788 g/cm^3. Density of ethanol is .789 g/cm^3. Assume that the volume of acetone and ethanol add.
Electrolysis - Aluminium extraction, a. Aluminium is extracted from its ore by an electrolytic process. One extraction plant uses an applied e.m.f. of 5 V, and a current of 225 000 A. One tonne of aluminium is extracted after 14 hours.
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