22. Which of the following compounds gives an infrared Spectrum with peaks at 3300cm (sharp Peak) and 2150 cm (sharp Peak) ? LH ₂ CH ₂ C CH CH3C=CCH3 2 1 HC CH 1 H₂C A) I B)2 c) 3 04 CAZ 3 CH ₂
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- what are the significant peaks of C4H9Br at 2970 cm-1 1209 cm-1A low-resolution mass spectrum of the neurotransmitter dopamine gave a molecular ion at m/z = 153. Two possible molecular formulas for this molecular ion are C8H11NO2 and C7H11N3O. A high-resolution mass spectrum provided an exact mass at 153.0680. Which of the possible molecular formulas is the correct one?4. NMR: (8 pts) Look at the given molecules and answer the following questions H H Compound A Compound B Compound C OH H Compound D How many different chemical environments (number of peaks) would you expect to see in the 'H NMR for each molecule? A = B = C = D: = Predict how many sub peaks per multiplet would be seen in the signal for the indicated hydrogen due to spin-spin splitting? A = B = C = D = How many H of that particular type (integration) would you expect to see at the indicated hydrogen? A = B = C = D= =
- Why is it most accurate to measure absorbances in the range A = 0.3 to 2?CO9TO9Q4167 The mass spectrum of an unknown compound has a molecular ion peak with a relative intensity of 54.77% and an M+1 peak of 6.66%. How many carbon atoms are in the compound? (Fill in an integer number)Q10) Describe spectrophotometry tests? If you were given a solution that contains an absorbing molecule how would you determine its max absorbance?
- Explain the concept of Alkyl Halides and the M + 2 Peak ?Please select the correct answer choice(s) from the following The "triplet" at 77.6 ppm is [ CHCl3/ CDCl3/ TMS/ water ]. The peak intensities of this triplet are due to the fact that [ there are three Cl's/ the shapes of the multiplets are different in 13C NMR compared to 1H NMR/ D has three possible spin states ].interpret/identify the peaks and their characteristics. (ex. C=O, 4H, doublet) compound name: isopentyl acetate (C7H14O2)
- 3. A solution of [FeSCN]2 is found to have 37.4 % transmission at 447 nm. If the molar absorption coefficient (e) is 4400 at Amax 447 nm, what is the concentration of [FeSCN]2 in the solution?3. Identify C-Cl stretching peaks in CDC13 and CHC13 spectra. Do these peaks have exactly the same frequencies for both compounds? Explain your answer. 4. Is the C==O stretching frequency the same for acetone and deuterated acetone? Explain your answer. 5. Identify C==O overtone in acetone spectrum which corresponds to the transition from ground level, n=0, to the second excited level, n=2.2. ] You make 150.0 mL of a copper(II) sulfate solution but forget to cover it before leaving for the day. The next class, you measure the volume and find that you only have 132.0 mL remaining. You didn’t record the initial concentration, but you measure the absorbance of the remaining solution at 620 nm and find that it is 0.386. You also construct the following calibration curve for CuSO4: Standard solution Abs620 0.50 M 0.424 0.40 M 0.336 0.30 M 0.247 0.20 M 0.159 (refer to image) a. What is the value for k (in Beer’s Law)? Provide a calculation or graph to support your answer. b. What is the concentration of the (remaining) solution? c. What was the concentration of the original solution from the first class? d. If you removed 7.5 mL from the 132.0 mL solution in the process of measuring the absorbance, how much water should you add to obtain the original concentration that you solved for in part (c)?