18. Which of the following molecules has a characteristic stretch at 3300 cm-1? (A)(CH3)2CHCO2CH3 (B) (CH3)2CHCH2N(CH3)2 (C) (CH3)3CH (D)(CH3)2CHCH=CH2 (E) (CH3)2CHC≡CH

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