31P is the only phosphorus isotope present at natural abundance

31P is the only phosphorus isotope present at natural abundance and has a nuclear spin of ± 1/2The 1H NMR spectrum of trimethyl phosphite, (CH3O)3P, exhibits a doublet for the methyl protons with a splitting of 12 Hz.
(a) Into how many peaks is the 31P signal split?
(b) What is the difference in chemical shift (in hertz) between the lowest and highest field peaks of the 31P multiplet?

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