Chemistry

posted by .

I posted this last night, A 0.500L vessel initially contains 0.0125 mol of H2S2 . Find the equilibrium concentrations of H2 and S2. Kc = 1.67 x 10^-7
2 H2S <--> 2 H2 + S2
I have come up with this equation so far, but I am lost now because I don’t even know if this is right.

1.67x10^-7 = ((4x^2)(x)) / (0.000625-4x^2)

  • Chemistry -

    It's close but not right.
    1.67E-7 = (2x)^2(x)/(0.025-2x)^2 is what you started with and that's correct. Your error was in expanding the denominator.
    1.67E-7 = 4x^3/(6.25E-4 -0.1x +4x^2)
    The next step is to multiply 1.67E-7 x the denominator, then collect the terms in descending order and you end up with a cubic equation. I haven't checked this but I ended up with (and you should go through the math to make sure it's right)
    4x^3 -6.68E-7x^2 +1.67E-8x -1/04E-10 = 0
    and solve that for x.

  • oops--Chemistry -

    I made a typo in that cubic equation.
    4x^3-6.68E-7x^2+1.67E-8x-1.04E-10 = 0

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. AP CHEM

    I would really appreciate some help on this problem. =) At 218 C, Kc = .00012 for the equilibrium NH4HS(s)<==> NH3(g)+ H2S(g) Calculate the equilibrium concentrations of NH3 and H2S if a sample solid NH4HS is placed in a closed …
  2. equilbrium II

    when CO2 (.15mol) and H2 (.302g) in a 500L vessel at 576'C are allowed to come to equilibrium the mixture contains .000183 mol/L of H20. what is the equilibrium concentration of CO?
  3. Chemistry

    X2 + Y2 <=> 2XY 0.50 mole each of X2 and Y2 are placed in a 1.0 litre vessel and allowed to reach equilibrium at a given temperature. The equilibrium concentrations of XY is found to be 0.025 mol/L. What is the equilibrium cosntant …
  4. chemistry

    If 1.00 mol of iodine and 0.50 mol of chlorine are initially placed into a 2.00 L reaction vessel at 25 degrees celsius, find the concentrations of all entities at equilibrium
  5. chemistry(just need to clarify, no need to solve)

    When a sample of NO2(g) (5.641 mol) is placed in 360.0 L reaction vessel at 716.0 K and allowed to come to equilibrium the mixture contains 3.412 mol of NO(g). What is the equilibrium concentration (mol/L) of NO(g)?
  6. college chemistry

    When a sample of HI(g) (5.825 mol) is placed in 320.0 L reaction vessel at 702.0 K and allowed to come to equilibrium the mixture contains 1.052 mol of H2(g). What is the equilibrium concentration (mol/L) of HI(g)?
  7. AP CHEMISTRY

    A mixture of H2, S, and H2S is held in a 1.0-L vessel at 90°C and reacts according to the equation H2(g) + S(s) H2S(g). At equilibrium the mixture contains 0.46 g of H2S and 0.40 g H2. (a) Write the equilibrium-constant expression …
  8. Chemistry

    When CH4(g) (0.06318 mol/L) and 16.43 mol of H2S(g) in a 130.0 L reaction vessel at 711.0 °C are allowed to come to equilibrium the mixture contains 0.04107 mol/L of CS2(g). What is the equilibrium concentration (mol/L) of H2S(g)?
  9. Chemistry

    A 0.500L vessel initially contains 0.0125 mol of H2S2 . Find the equilibrium concentrations of H2 and S2. Kc = 1.67 x 10^-7 2 H2S <--> 2 H2 + S2
  10. chemistry

    A mixture of 0.100 mol NO, 0.200 mol H2 and 0.0800 mol N2 were placed in a 2.00L reaction vessel, heated, and allowed to come to equilibrium conditions. At equilibrium, the molar concentration of N2 was 0.0500 mol/L. Calculate Kc for …

More Similar Questions