Three compounds were found to have the same empirical formula, that is the same number of carbons,...

Question

Three compounds were found to have the same empirical formula, that is the same number of carbons, hydrogens, oxygens, etc.; however, compound A absorbs at 268 nm, B at 278 nm, and C at 316 nm. What might you conclude about the structures of these three compounds?  2) Tylenol is found to absorb at245nm(A1=668) in aqueous acid and at 257nm(A1=715) in aqueous alkaliWhere A1 = AbsorbancyIf an acid solution in a 1 cm cuvette was found to have an absorbance of 0.669 absorbance units, what was the concentration of tylenol in the solution? If the absorbance of a basic solution of tylenol was 2.0, what would its concentration be? 	Would you use UV spectrophotometry to screen for either or both of methamphetamine and diazepam compounds?     	How can the relative scarcity of drugs that fluorescence be an advantage in some instances and a disadvantage in others?     	Why is UV/visible spectrophotometry most often used for screening rather than for confirmation?     	At pH 9.2, seconal absorbs at 239 nm. At pH 13, the absorbance shifts to 254 nm. Of what class of compounds is this characteristic and why?  Please provide me at least XXXXXXXXXXwords of answer for each question.
	
Document Preview: Three compounds were found to have the same empirical formula, that is the same number of carbons, hydrogens, oxygens, etc.; however, compound A absorbs at 268 nm, B at 278 nm, and C at 316 nm. What might you conclude about the structures of these three compounds? XXXXXXXXXXTylenol is found to absorb at245nm(A1=668) in aqueous acid and at 257nm(A1=715) in aqueous alkali Where A1 = Absorbancy    If an acid solution in a 1 cm cuvette was found to have an absorbance of 0.669 absorbance units, what was the concentration of tylenol in the solution? If the absorbance of a basic solution of tylenol was 2.0, what would its concentration be? Would you use UV spectrophotometry to screen for either or both of methamphetamine and diazepam compounds?  How can the relative scarcity of drugs that fluorescence be an advantage in some instances and a disadvantage in others?Why is UV/visible spectrophotometry most often used for screening rather than for confirmation?At pH 9.2, seconal absorbs at 239 nm. At pH 13, the absorbance shifts to 254 nm. Of what class of compounds is this characteristic and why?Please provide me at least XXXXXXXXXXwords of answer for each question.

David · Accepted Answer

TTs030213_77236_1 
1) Three compounds were found to have the same empirical formula, that is the 
same number of carbons, hydrogens, oxygens, etc.; however, compound A 
absorbs at 268 nm, B at 278 nm, and C at 316 nm. What might you conclude 
about the structures of these three compounds? 
 
       2)  Tylenol is found to absorb at 
245nm(A1=668) in aqueous acid and at 257nm(A1=715) in aqueous alkali 
 Where A1 = Absorbancy     
If an acid solution in a 1 cm cuvette was found to have an absorbance of 0.669 
absorbance units, what was the concentration of tylenol in the solution? If the 
absorbance of a basic solution of tylenol was 2.0, what would its concentration be?
3) Would you use UV spectrophotometry to screen for either or both of 
methamphetamine and diazepam compounds?
4) How can the relative scarcity of drugs that fluorescence be an advantage in some 
instances and a disadvantage in others?
5) Why is UV/visible spectrophotometry most often used for screening rather than 
for confirmation?
6) At pH 9.2, seconal absorbs at 239 nm. At pH 13, the absorbance shifts to 254 nm. 
Of what class of compounds is this characteristic and why?
Please provide me at least 175-200 words of answer for each question. 
Question # 1 
1) Three compounds were found to have the same empirical formula, that is the 
same number of carbons, hydrogens, oxygens, etc.; however, compound A 
absorbs at 268 nm, B at 278 nm, and C at 316 nm. What might you conclude 
about the structures of these three compounds?
 Ultra violet and visible spectroscopy or electronic spectroscopy is primarly used to 
measure multiple bond or aromatic conjugation and to identify functional groups with 
in molecules. The uv region extends from 100-400 nm. Below 200nm is called far uv or 
vaccum UV, while between 200-400 nm is called near UV region.When electromagentc 
radiation  is passed (UV or visible) through a compound, a portion of the radiation is 
absorbed by the molecule and the extend of absorption depends on the wave length of 
the radiation, structure of the compound and the presence of functional group. As a 
result of the absorbtion, there will be different electronic transitions. He main electronic 
transitions are σ→σ*, n→σ*, π→π* and n→π*. 
Chromophore is a covalently unsaturated group like C=C or C=O, NO2 etc which is 
responsible for electronic excitation. Auxochrome is a group that is not directly involved 
in electron transition,

Three compounds were found to have the same empirical formula, that is the same number of carbons, hydrogens, oxygens, etc.; however, compound A absorbs at 268 nm, B at 278 nm, and C at 316 nm. What...

Solution

Answer To This Question Is Available To Download

Related Questions & Answers

Submit New Assignment