Gen Chm II

Determine the pressure-based Keq for the reaction:
2SO2(g) + O2(g)<--->2SO3(g)

given that 1.00×10−2 moles of SO2 and 2.00×10−2 moles of O2 were initially placed in a 2.00 L reaction chamber. The chamber contained 7.5×10−3 moles of SO3 when equilibrium was established at 727 °C. Since you need to calculate the pressure-based equilibrium constant, you will need to use the ideal gas equation (PV=nRT) to convert the moles of gas into pressure with units of atmospheres. (remember that one formulation of R is 0.0821 L·atm/mol·K)

Kind of overwelmed me, thank you for your help

  1. 👍 0
  2. 👎 0
  3. 👁 152
asked by James
  1. I think the easiest thing to do is use mols to begin and convert to pressure later.
    ..........2SO2 + O2 ==> 2SO3
    I.........0.01..0.02.....0
    C.........-2x....-x.....2x
    E.......0.01-2x..0.02-x..2x

    The problem tells you that E mols sO3 = 0.0075 so 2x = 0.0075 which makes x = 0.00375
    That means mols sO2 = 0.01-2x
    and mols O2 = 0.02-x
    and mols SO3 = 0.0075
    Now convert each of those to pressures in atmospheres using PV = nRT. You know n, R, T is 727+273 = 1000 and V is 2L
    Substitute p into
    Kp = pSO3^2/pSO2^2*pO2 and solve for Kp.

    1. 👍 0
    2. 👎 0
    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. chem class

    The value of Keq for the following reaction is 0.25: SO2 (g) + NO2 (g) SO3 (g) + NO (g) The value of Keq at the same temperature for the reaction below is __________. 2SO2 (g) + 2NO2 (g) 2SO3 (g) + 2NO (g) answer is 0.25 how do i

    asked by richy on November 18, 2010
  2. Equilibrium

    2 SO2(g) + O2(g) 2SO3(g) Initially, 1.6mol SO3 is placed in a 3.0L container. At equilibrium, [O2] = 0.15M. What is the value of Keq? A. 0.26 B. 1.2 C. 4.0 D. 43 My work: ...2SO2...+...O2......2SO3 I 0.53M.....-----.........-----

    asked by Jessica on November 13, 2014
  3. chem

    0.020 mol of each SO2 and O2 and So3 is placed in a 1.0 L flask and allowed to come to equilibrium. The equilibrium of [SO2] is found to be 0.0080M. What is the value of keq for the reaction: 2SO2+O2 2SO3

    asked by a on October 13, 2015
  4. Equilibrium

    An equilibrium mixture at 852 K is found to contain 3.61*10^-3 mol/L of SO2, 6.11*10^-4 mol/L of O2, and 1.01*10^-2 mol/L of SO3. Calculate the equilibrium constant Keq, for the reaction where SO2 and O2 are reactants and SO3 is

    asked by Tyler on August 3, 2015
  5. chemistry

    An equilibrium mixture of SO2,SO3 and O2 gases is maintained in a 11.5 L flask at a temp at which Kc=55.2 for the rxn: 2SO2 + O2 2SO3. If the # of moles of SO2 and SO3 are =, how many moles of O2 are present? I let SO2 and SO3 =x

    asked by Holly on September 14, 2011
  6. Chemistry

    Which of the following statements is incorrect concerning the thermochemical equation below? 2SO3(g)  2SO2(g) + O2(g); H° = 198 kJ a. The enthalpy of the reactants exceeds that of the products. b. The reaction is

    asked by Kayla on July 2, 2013
  7. Chemistry

    Which of the following statements is incorrect concerning the thermochemical equation below? 2SO3(g)  2SO2(g) + O2(g); H° = 198 kJ a. The enthalpy of the reactants exceeds that of the products. b. The reaction is

    asked by Jessica on July 2, 2013
  8. chemistry(just to double check)

    The initial pressure for the compounds involved in the reaction displayed were determined to be P(SO2(g)) = 0.5932 atm, P(O2(g)) = 0.4886 atm, P(SO3(g)) = 0.09287 atm. Calculate the value of the equilibrium constant (Kp) at 1000 K

    asked by bme1 on April 6, 2010
  9. Chemistry

    Calculate the enthalpy change for the reaction: 2S(s) + 3O2(g) --> 2SO3(g) Use the following thermochemical equations: Reaction S(s) + O2(g) --> SO2(g) Delta H(in kJ) -296.8 2SO2(g) + O2(g) --> 2SO3(g) Delta H(in kJ) -197.0

    asked by Jordin on October 13, 2010
  10. chemistry

    6. Determine Keq for the reaction: 2 SO2 (g) + O2(g) 2 SO3(g), given that 1.00 x 10-2 moles of SO2 and 2.00 x 10-2 moles of O2 were placed in a 2.00L reaction chamber. The chamber contained 7.5 x 10-3 moles of SO3 when equilibrium

    asked by Olivia on February 25, 2010

More Similar Questions