I figured out the others, but C, E, and F are elusive. (c) Al2O3(s) + 3 CO(g) 2

Question

I figured out the others, but C, E, and F are elusive.

(c) Al2O3(s) + 3 CO(g) 2 Al(s) + 3 CO2(g) kJ/mol Spontaneity spontaneous O nonspontaneous O at equilibrium (d) CaO(s) +H2O(/) Ca(OH)2(s) kJ/mol Spontaneit spontaneous O nonspontaneous O at equilibrium (e) N20(g)+O2(g)N2O3(g) kJ/mol Spontaneity spontaneous O nonspontaneous O at equilibrium (f) MgSO4 . 7 H2O(s) MgSO4(s) + 7 H2O(g) For this part only, use the following data MgSO4 7 H20 (s) MgS04(5) H20 (g) 298 =-2871.9 kJ/mol 298 =-1170.7 kJ/mol 298 =-228.6 kJ/mol kJ/mol Spontaneity spontaneous O nonspontaneous O at equilibrium

Explanation / Answer

c) DG0rxn = (2*DG0rxn,CO2 + 2*DG0f,Al)-(1*DG0f,Al2O3 + 3*DG0f,CO)

           = (2*-394.39+2*2*0) - (1*-1582.3 + 3*-137.16)

           = 1205 Kj

   as DG0rxn is +ve, the reaction is nonspontaneous.

e) N2O(g) + O2(g) ---> N2O3(g)

DG0rxn = (1*DG0rxn,N2O3)-(1*DG0f,N2O + 3*DG0f,O2)

         = (1*139.46)-(220.1 +3*205)

         = -695.64 kj

as DG0rxn is -ve, the reaction is spontaneous.

f)

DG0rxn = (1*DG0rxn,MgSO4 + 7*dG0f,H2O)-(1*DG0f,MgSO4*7H2O)

         = (-1170.7 + 7*-228.6) - (-2871.9)

          = 101 Kj

   as DG0rxn is +ve, the reaction is nonspontaneous.

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