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Use data from the table below to calculate the equilibrium constants at 25 ?C for each...

Use data from the table below to calculate the equilibrium constants at 25 ?C for each reaction. Standard Thermodynamic Quantities for Selected Substances at 25?C Substance ?H?f(kJ/mol) ?G?f(kJ/mol) S?(J/mol?K) ?G of PH3=13.5, ?G of H2=0, ?G of P4=24.4

3/2H2(g)+1/4P4(g)?PH3(g)

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Answer #1

3/2H2(g) + 1/4P4(g) <----> PH3(g)

DG0rxn = (1*DG0f,PH3(g) ) - (3/2*DG0f,H2 + 1/4*DG0f,P4)

       = (1*13.5) - (3/2*0 + 1/4*24.4)

       = 7.4 Kj/mol

dG0 = -RTlnK

7.4*10^3 = -8.314*298lnk

k = equilibrium constant = 0.0504

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