chemistry 112

the formation of SO3 from so2 and o2 is an intermediate step in the manufacture of sulfuric acid, and it is also responsible for the acid rain phenomenon. the equilibrium constant Kp for the reaction is 0.13 at 830 degree celcius. in one experiment, 2.00 mol so2 and 2.00 mol o2 were initially present in a flask. what must the total pressure at equilibrium be to have an 80.0 percent yield of so3?

  1. 👍 0
  2. 👎 1
  3. 👁 1,205
  1. For an 80% yield you will need 1.6 mols SO3.
    .........2SO2 + O2 ==> 2SO3
    I........2 mols..2.......0

    Then an 80% yield gives SO3 = 1.6 mol; therefore, 1.6 = 2x and x = 0.8
    Solve for 2-2x = 0.4 mol SO2
    2-x = 1.2 mols O2
    2x = 1.6 mol SO3

    Total mols = 0.4+1.2+1.6 = 3.2

    XSO2 = 0.4/3.2 = 0.125
    XO2 = 1.2/3.2 = 0.375
    XSO3 = 1.6/3.2 = 0.5

    pSO2 = XSO2*Ptotal
    pO2 = XO2*Ptotal
    pSO3 = XSO3*Ptotal

    Substitute these into Kp expression and solve for P. Post your work if you get stuck. I ran through it very quickly (and could have made a blunder) but something in the area of 330 atm I think for Ptotal.

    1. 👍 0
    2. 👎 1

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    At 900 K the following reaction has Kp=0.345; 2 SO2(g) + O2 (g) -> 2 SO3 (g) In an equilibrium mixture the partial pressures of SO2 and O2 are 0.145 atm and 0.455 atm, respectively. What is the equilibrium partial pressure of SO3

  2. chemistry

    Use standard enthalpies of formation to calculate ΔHrxn° for each reaction. (See the appendix. Enter your answer to the tenth place.) (a) 2 H2S(g) + 3 O2(g) 2 H2O(l) + 2 SO2(g) (b) N2O4(g) + 4 H2(g) N2(g) + 4 H2O(g) (c) SO2(g) +

  3. Chemistry

    Consider the following reaction: 2 SO2 (g) + O2 (g)----> 2 SO3 (g) If 285.3 mL of SO2 is allowed to react with 158.9 mL of O2 (both measured at 315 K and 50.0 mmHg), what is the limiting reactant and theoretical yield of SO3 in

  4. Chemistry

    Consider the following mixture of SO2(g) and O2(g).If SO2(g) and O2(g) react to form SO3(g),draw a representation of the product mixture assuming the reaction goes to completion. What is the limiting reactant in the reaction? If

  1. Chemistry

    SO2(g) + NO2(g) SO3(g) + NO (g) At a given temperature, analysis of an equilibrium mixture found [SO2] = 4.00 M, [NO2] = 0.500 M, [SO3] = 3.00 M, and [NO] = 2.00 M. (a) What is the new equilibrium concentration of NO when 1.50

  2. Chemistry

    What would be more acidic? SO2 or SO3? Does this have to do something with the higher oxidation state? And why is that? Or can we say SO3 is more acidic by, SO2+H2O--->H2SO3 SO3+H2O--->H2SO4 as H2SO4 is more acidic?

  3. Chemistry

    Sulfur trioxide, SO3, is made from the oxidation of SO2, and the reaction is represented by the equation 2SO2 + O2 2SO3 A 25-g sample of SO2 gives 18 g of SO3. The PERCENT YIELD of SO3 is?

  4. chem

    (a) At 800 K the equilibrium constant for I2(g) 2 I(g) is Kc = 3.1 10-5. If an equilibrium mixture in a 10.0-L vessel contains 3.25 10-2 g of I(g), how many grams of I2 are in the mixture? (b) For 2 SO2(g) + O2(g) 2 SO3(g), Kp =

  1. General Chemistry

    At a certain temperature, the equilibrium constant for the following chemical equation is 2.90. At this temperature, calculate the number of moles of NO2(g) that must be added to 2.53 mol of SO2(g) in order to form 1.10 mol of

  2. Chemistry

    SO3 can be produced in the following two-step process: FeS2 + O2 ---> Fe2O3 + SO2 S02 + O2 ----> SO3 Assuming that all the FeS2 reacts, how many grams of SO3 are produced when 20.0 g of the FeS2 reacts with 16.0 g of O2?

  3. Enthalpy Change?

    Given the thermochemical equation SO2(g) + ½ O2(g) ® SO3 (g) DH = -99.1 kJ calculate the enthalpy change (DH) when 89.6 g of SO2 is converted to SO3 a. -69.3 kJ b. -139 kJ c. 69.3 kJ d. 139 kJ e. -111 kJ

  4. Chemistry

    Sulfur trioxide decomposes into sulfur dioxide and oxygen in an equilibrium. You have a 3.00 L vessel that is charged with 0.755 mol of SO3. At equilibrium, the amount of SO3 is 0.250 mol. 2 SO3 (g) ----> 2 SO2 (g) +O2 (g) A)

You can view more similar questions or ask a new question.