Use ?G?f values from Appendix IIB to calculate the equilibrium constants at 25 ?C for each...

Use ?G?f values from Appendix IIB to calculate the equilibrium constants at 25 ?C for each of the following reactions.

a. 2NO2(g)?N2O4(g)

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

Solutions

Expert Solution

a. 2NO2(g)---------------------> N2O4(g)

Grxn = Gproducts - Greactants

= 99.8 - (2 x 51.3)

= -2.8 kJ / mol

Grxn = - R T ln K

-2.8 = -(8.314 x 10^-3 ) x 298 x ln K

ln K = 1.13

K = 3.10

equilibrium constant = K = 3.10

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

Grxn = Gproducts - Greactants

= 13.5 - (1/4 x 24.4)

= 7.4 kJ / mol

Grxn = - R T ln K

7.4 = -(8.314 x 10^-3 ) x 298 x ln K

ln K = -2.99

K = 0.050

equilibrium constant = K = 0.050

queen_honey_blossom answered 6 months ago

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