Question

8.17 Suppose that vo moles of H20 gas are introduced into a container of fixed vol- ume V at a temperature low enough so that virtually all the gas remains undis- sociated in the form of H20 vapor. At higher temperatures dissociation can take place according to the reaction 24,0 2H2 + 02 Let & denote the fraction of H2O molecules which are dissociated at any temper- ature T corresponding to a total gas pressure p. Write an equation relating & to p and K (T).

Answer 1

A+ Given Reaction 2 Holg) ² a Higl + aigl Initial Vomole Omole Onde (V. - Elmole Emole Emole Equilibrium Total No of moles at Equilibrium - = | ro-E + E + E/). - Total (Vot 8/2) lo (Mole fraction of 0,1g) = no(8) - n total {/2 Vot El nito २ + Fatig total belgy = 1 vot El) = (arote) - Kholg 2018) total - VoE (+ €/2) a Xholg = 2(No-E) ant El PH₂ 19 = XH, 18) XP Loop - Total Pressur Poig = Xo (9) XP Polg) = Quot El XP PHOLA = Xh org x P = 2 (Vo ) Quote)

Constant Kp = Equilibriun (PH₂)² x P ₂ (Pro)? Kp = Quote) avote Qu+E) J

4E3 Kp = (27o+) x B(Vo-ej? I Kp = Tarot E) X (V. -² 1