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

How many protons, neutrons, and electrons are in one atom of ? Data sheet and Periodic Table

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

Between two samples of helium and neon at the same temperature, which (if any) has the highest average kinetic energy and which (if any) has the highest average speed?   Data sheet and Periodic Table

Which microscopic representation best represents a solution?  Data sheet and Periodic Table

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

Which statement best describes the bond length(s) in the nitrite ion (shown)?  The bond length of N–O is 136 pm and N=O is 122 pm.          Data sheet and Periodic Table

How many sigma (σ) and pi (π) bonds are in the molecule shown?           Data sheet and Periodic Table

For the orbital diagram shown, what is a possible set of quantum numbers for the next lowest energy electron added?        Data sheet and Periodic Table

Using formal charges, which Lewis dot structure is correct for the carbonate ion, CO32–?   Data sheet and Periodic Table