**NMR Signal Analysis**A \( ^1 \text{H} \) NMR signal is observed at 199.0 Hz (downfield of TMS) on a 1.40 x \( 10^2 \)-MHz instrument.a) **What is the observed chemical shift in parts per million (ppm)?** Chemical shift is: \(\_\_\_\_\_\_\) ppmb) **What is the chemical shift, in parts per million (ppm), if the sample is analyzed with a 300.0-MHz instrument?** Chemical shift is: \(\_\_\_\_\_\_\) ppmc) **Where will the proton signal appear, in hertz, if the sample is analyzed with a 300.0-MHz instrument?** The downfield signal is: \(\_\_\_\_\_\_\) Hz**Explanation:**- **Chemical Shift Calculation:** Chemical shift in ppm can be calculated using the formula: \[ \text{Chemical Shift (ppm)} = \frac{\text{Observed Frequency (Hz)}}{\text{Spectrometer Frequency (MHz)}} \] - **Instrument Calibration Differences:** - Part b examines the chemical shift using a different instrument frequency (300.0 MHz). - Part c translates this chemical shift back into Hz for this new instrument frequency, showing how the position of the signal shifts on different instruments.

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10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...