A natural products chemist isolated the sphingolipids shown at the right(alpha-GalCerBf) as the mixture of compounds that differed in their chain lengths. The structures shown, including the branching pattern, were determined NMR.   The table below includes the found high-resolution masses of the three major isomers (negative mode,{M-H}-). Fill in the calcualted masses and the error ppm.

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Q: [A] [B] rate trial M/s 1. 0.827 0.647 0.048 0.442 0.976 2.

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.