Both questions please. frequescy 71. Dr. N. M. Arr was called in to help analyze

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Both questions please.

frequescy 71. Dr. N. M. Arr was called in to help analyze the 'H NMR spectrum of a mixture of compounds known to cootain only C, H and Br. The mixture showed two singlets-one at 1.8 ppm and the other at 2.7 ppm-with relative istegrabs of 1 :6, respectivel Dr Arr determined that the spectrum was that of a mixture of bromomethane and 2-bromo-2-methylpropane. What was ibe rali of bromomethane to 2-bromo-2-methylpropane in the mixture? 72. Calculate the amount of energy (in calories) required to flip an 'H nucleus in an NMR spectrometer that operates at 300 MH

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Both questions please. frequescy 71. Dr. N. M. Arr was called in to help analyze

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