Chemistry

Can anyone help me with these three questions?

Predict the sign of delta S° and then calculate delta S° for each of the following reactions

a. 2H2S(g) + SO2(g) --> 3S(rhombic)(s) + 2H2O(g)
b. 2SO3(g) --> 2SO2(g) +O2(g)
c. Fe2O3(s) + 3H2(g) --> 2Fe(s) + 3H2O(g)

Thank you! I appreciate your help!

  1. 👍
  2. 👎
  3. 👁
  1. a. You are going from 3 moles of gas to 2 moles of gas and 3 moles of solid. So, you are decreasing the number of moles of gas particles, so the entropy would decrease, giving a ΔS < 0.

    b. Here, you're going from 2 moles of gas to 3, so ΔS would probably be positive.

    c. Here the number of moles of gas is the same on both sides, but the total number of particles is increasing in the reaction so I would guess that ΔS would be slightly positive.

    If this is not helpful then just tell me. I will try my best to explain it in another way. Also, are there any answer choices to go along with this question?

    1. 👍
    2. 👎
  2. I would just like to know how to calculate the delta S. And no, there are no answer choices with the question. However, thank you for taking the time to help me.

    1. 👍
    2. 👎
  3. To calculate dS for each reaction, it is
    dSrxn = (n*dSo products) - (n*dSo reactants)
    You look up the dSo values in your text or notes.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. AP Chemistry

    Calculate the delta H rxn for the following reaction: CH4(g)+4Cl2(g)-->CCl4(g)+4HCl Use the following reactions and given delta H's: 1) C(s)+2H2(g)-->CH4(g) delta H= -74.6 kJ 2) C(s)+2Cl2(g)-->CCl4(g) delta H= -95.7 kJ 3)

  2. Chemistry

    For the reaction described by the chemical equation: 3C2H2(g) -> C6H6(l) .. Delta H rxn = -633.1 kJ/mol a) Calculate the value of Delta S rxn at 25.0 C... b) Calculate Delta G rxn... c) In which direction is the reaction, as

  3. Chemistry

    Which of the following reactions are spontaneous (favorable)? A] 2Mg(s) + O2(g) -> 2MgO(s) Delta G = -1137 kJ/mol .. B] NH3(g) + HCl(g) -> NH4Cl(s) Delta G = -91.1 kJ/mol ... C] AgCl(s) -> Ag+(aq) + Cl-(aq) Delta G = 55.6 kJ/mol

  4. Chemistry

    consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi

  1. Chemistry

    Given 2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide? How do I find heat of formation from standard enthalpy change? I know how to do it when I'm given

  2. Chemistry

    If the sign for delta G is negative (spontaneous process) and sign for delta S is positive (more disorder) for both dissolving processes, how could one be endothermic (positive delta H- NaNO3 dissolves in water) and one be

  3. Chemistry

    Given the thermodynamic data in the table below, calculate the equilibrium constant for the reaction: 2SO2(g)+O2--> 2SO3 Substance (DeltaH^o) (Delat S^o) SO2 -297 249 O2 0 205 SO3 -395 256 Answer (it was given) 2.32x10^24 Even

  4. chemistry

    Given overall reaction: P4 + 10Cl2 ---> 4PCl5 Delta H for the reaction = ? PCl5 -----> PCl3 + Cl2 Delta H = +157 kJ P4 + 6Cl2 ----> 4PCl3 Delta H = -1207 kJ Calculate the Delta H for the overall reaction.

  1. Chemistry

    delta T = ikfm delta T is the amount f.p. is lowered. i is the number of particles; i.e., Na3PO4 will have i = 4 (3 for Na and 1 for PO4). m is molality. k is a constant and need not enter into the calculations. Arrange the

  2. Chemistry

    Calculate the delta H and delta S for the reaction. From there, calculate the delta G at 25 degrees Celsius. Predict whether it the reaction is spontaneous or non-spontaneous under standard conditions. CH3OH(l)+ O2(g)--> HCO2H(l)+

  3. chmistry

    3O2(g)---> 2O3(g) Delta H = +284.6 kJ what is the sign of delta G and delta S

  4. CHEMISTRY

    Please explain. The enthalpy changes for two different hydrogenation reactions of C2H2 are: C2H2+H2---->C2H4 Delta H 1 C2H2+2H2---->C2H6 Delta H 2 Which expression represents the enthalpy change for the reaction below?

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