Consider a closed vessel in which selenium is in equilibrium with its vapor. Selenium, in the vapor

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Consider a closed vessel in which selenium is in equilibrium with its vapor. Selenium, in the vapor phase, polymerizes to Sei species where i = 1, 2, 3, 5, 7, 8. 

a. At any temperature above the melting point of selenium, compute the degrees of freedom in the system. Note that the vapor-phase reactions can be considered to be

iSe Se, and Se + SeiSei+1

b. Develop an interrelationship between the partial molar Gibbs energies of each of the selenium species in the vapor phase.

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