Calculate the equilibrium constants at 25°C for each of

Could someone work these out so I understand them.

calculate the equilibrium constants at 25°C for each of the following reactions.

1) 2 NO2 (g) <--------> N2O4 (g)

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

1 Answer

  • Without some numbers, you can't actually calculate a numerical value for Kc.

    Kc = [N2O4] / [NO2]^2

    Kc = [PH3] / ( [H2]^(3/2) [P4]^(1/4)

    or 3/2 H2 (g) + 1/4 P4 (g) <==> PH3 (g) can be written as...

    6H2 + P4 <==> 4PH3

    Kc = [PH3]^4 / ( [H2]^6 [P4] )

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