Respuesta :
The chemical shift, in parts per million (ppm), if the sample is analyzed with a 400.0 ‑MHz instrument is
if ¹H signal observed = 194.0 Hz
frequency = 115 MHz
the chemical shift = shift ( Hz ) / spectrometer frequency
the chemical shift = 194 Hz / 115 MHz
= 1.68 ppm
for the same proton the chemical shift does not change . Thus, chemical shift in part per million of the sample analyzed with 400 MHz, the chemical shift will be same for 400 MHz that is 1.68 ppm.
this question is incomplete , the complete question is :
A ¹H NMR signal is observed at 194.0 Hz ( downfield of TMS) on a 115 MHz instrument.
a) what is the observed chemical shift in part per million?
b) what is the chemical shift, in parts per million (ppm), if the sample is analyzed with a 400.0 ‑MHz instrument?
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