Online AP chemistry Tutors 3417661 EM Sapling Learning Consider the decompositio

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Online AP chemistry Tutors 3417661 EM Sapling Learning Consider the decomposition of a metal oxide to its Substance (kJ/mol) elements, where M represents a generic metal. M304 7.30 M,O (s) 3M (s) 20 (R) M(s) O2(g) What is the standard change in Gibbs energy for the reaction, as written, in the forward direction? AG. kJ/ mol What is the equilibrium constant of this reaction, as written, in the forward direction at 298 K? What is the equilibrium pressure of Oz(g) over M(s) at 298 K? atm O Previous 8 Up & view solution checks Answer 0 Next H Exit Give Hint about us careers privacy policy terms of use contact us help Gra Pol You an

Explanation / Answer

For the reaction M3O4(s)<----> 3M(s) + 2O2(g)

deltaG of reaction = 3* deltaG of M + 2* deltaG of O2- deltaG of M3O4

3, 2, 1 are coefficients of M, O2 and M3O4 respectively.

deltaG= 3*0+2*0 +7.3

deltaG= 7.3 Kj/mole

deltaG= -RT lnK, K is equilibrium constant

RT lnK= -detlaG= -7.3*1000 J/mole

R= 8.314 J/mole.K

T= 298 K

lnK= -7.3*1000/(298*8.314)=-2.95

since the activity of M and M3O4 is unity,

K= 0.053 = [PO2]2 , where P is the partial pressure of O2

PO2= 0.23 atm

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