Because coupling constants (J values) are due to internal
interactions of a molecule and not an external magnetic field, they
are the same value on any spectrometer if reported in Hz (Hertz,
1/second). Unfortunately many times we only record NMR spectra with
a ppm (parts per million) scale and we must convert the ppm
difference to Hz on our own. To the nearest whole number (no
units), what is the J value in Hz of a doublet whose peaks are
separated by 0.013 ppm on a 600 MHz spectrometer?