20. An NMR spectrometer that operates at a frequency of 60 MHz for 13C NMR spectra, operates at what frequency for 1 H NMR spectra? (A)60 MHz (B) 15 MHz (C) 120 MHz (D)240 MHz (E) 30 MHz

5. The following two reactions are important in the blast furnace production of iron metal from iron ore (Fe2O3): Using these balanced reactions, how many moles of O2 are required for the production of 2.51 kg of Fe? (Molecular weight of Fe = 55.85 g/mol) (A)33.7 moles (B) 15.0 moles (C) 135 moles (D)44.9 moles (E) 1.88 moles

20. An NMR spectrometer that operates at a frequency of 60 MHz for ¹³C NMR spectra, operates at what frequency for ¹H NMR spectra?
(A)60 MHz
(B) 15 MHz
(C) 120 MHz
(D)240 MHz
(E) 30 MHz

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