Questiоn 3 — Bаlаncing Cоmbustiоn of аn Amino Acid Alanine (C3H7NO2) undergoes complete combustion in excess oxygen. The nitrogen-containing product is N2(g). Select the correctly balanced equation using lowest whole-number coefficients: __ C3H7NO2 + __ O2 → __ CO2 + __ H2O + __ N2 Hint: Because N₂ requires 2 N atoms and H₂O requires an even number of H atoms, you will need to multiply through to clear fractions. Check oxygen last.
Questiоn 4 — Limiting Reаctаnt: Thermite Reаctiоn The thermite reactiоn: Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(l) A chemist combines 100.0 g Fe2O3 and 54.0 g Al and allows the reaction to go to completion. What is the theoretical yield of Fe and what mass of the excess reactant remains unreacted? Molar masses: Fe2O3 = 159.69 g/mol; Al = 26.98 g/mol; Fe = 55.85 g/mol Warning: On a mass basis, 100 g Fe2O3 looks like the larger quantity — convert to moles before deciding which is limiting.