chemistry calculations

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At 25 deg C, Kc is 5.84x10-3 for the dissociation of dinitrogen tetraoxide to nitrogen dioxide.
N2O4(g) ==== 2NO2(g)
a) Calculate the equilibrium concentration of both gases when 4.00 grams of N2O4 is placed at 2.00-liter flask at 25 deg C.

b) What will be the new equilibrium concentrations if the volume of the system is suddenly increased to 3.00-liters at 25 deg C?
c) What will be the new equilibrium concentrations if the volume is decreased to 1.00-liter at 25 deg C?

  1. DrBob222

    mols N2O4 = 4/molar mass = 4/92 = about 0.0435M
    M N2O4 = 0.0435/2 = about 0.0217M

    ..........N2O4 ==> 2NO2
    I.........0.0217.....0
    C.........-x........2x
    E.......0.0217-x....2x

    Substitute the E line into Kc expression and solve for x and 0.0217-x

    b and c are done the same way.
    Post your work if you get stuck.

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