What is the standard molar enthalpy of formation for aluminum oxide (Al2O3) based on the thermochemical equations provided?4Fe(s) + 3O2(g) 2Fe2O3(s)                         ΔH°1 = –1648.4 kJ·mol–12Al(s) + Fe2O3(s)2Fe(s) + Al2O3(s)         ΔH°2 = –851.5 kJ·mol–1   Data sheet and Periodic Table

What is the total volume of gases produced when 3.0 L of nitrogen trichloride (NCl3) decomposes into chlorine and nitrogen at a constant pressure and temperature?                2NCl3(g)N2(g) + 3Cl2(g)  Data sheet and Periodic Table

What mass (in g) of iron (Fe, molar mass = 55.85 g∙mol–1) is needed to experimentally produce 50.0 g of iron(III) oxide (Fe2O3, molar mass = 159.70 g∙mol–1) in excess oxygen if the percent yield is 78.7%?                               4Fe(s) + 3O2(g)2Fe2O3(s)   Data sheet and Periodic Table

What isotope is depicted in the figure?                                      Data sheet and Periodic Table

Which pure molecular substance will have the lowest vapor pressure at 25 oC?  Data sheet and Periodic Table

What element is oxidized and what is the oxidizing agent in the reaction below?                Fe2O3(s) + 3CO(g)2Fe(s) + 3CO2(g)  Data sheet and Periodic Table

Use the given heats of formation to calculate the enthalpy change for this reaction.B2O3(g) + 3COCl2(g)2BCl3(g) + 3CO2(g)ΔHof of B2O3(g) is –1272.8 kJ∙mol–1ΔHof of BCl3(g) is –403.8 kJ∙mol–1ΔHof of COCl2(g) is –218.8 kJ∙mol–1ΔHof of CO2(g) is –393.5 kJ∙mol–1   Data sheet and Periodic Table

Which pair of particles has the same number of electrons?   Data sheet and Periodic Table

What element is oxidized and what is the oxidizing agent in the reaction below?                Fe2O3(s) + 3CO(g)2Fe(s) + 3CO2(g)  Data sheet and Periodic Table

What is the molecular geometry around the N atom in the molecule depicted?           Data sheet and Periodic Table