General Questions These questions are not explicitly keyed to chapter topics; many requ...

General Questions

These questions are not explicitly keyed to chapter topics; many require integration of several concepts.

Many common nonmetallic elements exist as diatomic molecules at room temperature. When these elements are heated to 1500. K, the molecules break apart into atoms. A general equation for this type of reaction is

where E stands for an atom of each element. Equilibrium constants for dissociation of these molecules at 1500. K are

(a) Assume that 1.00 mol of each diatomic molecule is placed in a separate 1.0-L container, sealed, and heated to 1500. K. Calculate the equilibrium concentration of the atomic form of each element at 1500. K.

(b) From these results, predict which of the diatomic elements has the lowest bond dissociation energy, and compare your results with thermochemical calculations and with Lewis structures.