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Chapter 18: Q2P (page 456)
(a) How much energy (in kilojoules) is carried by one mole of photons of red light with= 650 nm?
(b) How many kilojoules are carried by one mole of photons of violet light with= 400 nm?
The answers to the above questions are,
(a) E = 184 kJ/mol
(b) E = 299kJ/mol
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Describe a different set of dilutions to produce 3 mg Fe/mL from 1 000 mg
Fe/mL
Semi-xylenol orange is a yellow compound at pH 5.9but turns red when it reacts with . A 2.025 - mLsample of semixylenol orange at pH 5.9was titrated withwith the following results:
Total role="math" localid="1663647483742" added | Absorbance at 490nmwavelength | Total added | Absorbance at490nmwavelength |
0.0 6.0 12.0 18.0 24.0 30.0 36.0 | 0.227 0.256 0.286 0.316 0.345 0.370 0.399 | 42.0 48.0 54.0 60.0 70.0 80.0 | 0.425 0.445 0.448 0.449 0.450 0.447 |
Make a graph of absorbance versus microliters of added. Be sure to correct the absorbances for dilution. Corrected absorbance is what would be observed if the volume were not changed from its initial value of 2.025Ml. Assuming that the reaction of semi orange with has a 1 : 1stoichiometry, find the molarity of semi-xylenol orange in the original solution.
Vapor at a pressure of bar from the solid compound pyrazine had a transmittance of 24.4% at a wavelength of 266nm in
a 3.00 - cm cell at 298K
Pyrazine
(a) Convert transmittance to absorbance.
(b) Convert pressure to concentration (mol/L) with the ideal gas law (Problem 1-18).
(c) Find the molar absorptivity of gaseous pyrazine at 266nm.
18-26. A 2.00mL solution of apotransferrin was titrated as illustrated in Figure 18-11. It required 163L of 1.43 mM ferric nitrilotriacetate to reach the end point.
(a) Why does the slope of the absorbance versus volume graph change abruptly at the equivalence point?
(b) How many moles of Fe(III) (= ferric nitrilotriacetate) were required to reach the end point?
(c) Each apotransferrin molecule binds two ferric ions. Find the molar concentration of apotransferrin in the 2.00mL solution.
What is the purpose of neocuproine in the serum iron analysis?
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