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How much heat is evolved or absorbed when 25.0 g of silver oxidizes to form silver oxide (Ag2O) under standard conditions? The enthalpy of formation (ΔHfo) of Ag2O is –31.05 kJ∙mol–1 and the molar mass of silver is 107.87 g∙mol–1.   Data sheet and Periodic Table

Which species has this ground-state electron arrangement?        1s2 2s2 2p6 3s2 3p6 3d10  Data sheet and Periodic Table

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

What is the molecular geometry around the N atom in the molecule depicted?           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

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

What is the hybridization of the indicated nitrogen atoms?                         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

What volume (in L) will 50.0 g of nitrogen gas occupy at 2.0 atm of pressure and at 65 oC? Data sheet and Periodic Table