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A low-resolution mass spectrum of the neurotransmitter dopamine gave a molecular ion at
Two possible molecular formulas for this molecular ion are
resolution mass spectrum provided an exact mass at
formulas is the correct one?
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Chapter 13 Solutions
ORGANIC CHEMISTRY
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- Explain what can be determined from the following mass spectrum. M* = 123 Relative Intensity 100- 80 9 20 0-mmm 25 50 wytrwytatyt||||||qqıbıkm 75 m/7 100 125arrow_forward4arrow_forwardFrom graphical analysis of a calibration plot, you generated the line y=2543.23x + 0.0034. Your sample had an Absorbance of 0.142. What is the concentration?arrow_forward
- 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)?arrow_forward(a) The pH of a solution is 5.42 + 0.05. Find [H1] and its uncertainty. (b) What is the relative uncertainty in [H1]? (c) Show that the relative uncertainty depends on the uncertainty in pH, but not on the value of pH.arrow_forwardA solution prepared by dissolving 25.8 mg of benzene (78.11 g/mol) in hexane (86.16 g/mol) and diluting to 250 mL had an absorption peak at 256 nm and an absorbance of 0.266 in a 1.000-cm cell. What is the concentration of benzene solution? O 1.20x10-3 M O 1.32x10-3 M O 1.32 M O 1.20 Marrow_forward
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