Thursday
March 26, 2015

Homework Help: Chem

Posted by Chris on Monday, April 9, 2007 at 8:27pm.

I was given a problem that my book did not explain how to do, so I attempted to figure it out myself. Let me know if my conclusion is fallacious.

Given the reactions
H2O(g) + CO(g) <--> H2(g) + CO2(g), K= 1.6
FeO(s) + CO(g) <--> Fe(s) + CO2(g), K= .67
Find K for the reaction
Fe(s) + H2O(g) <--> FeO(s) + H2(g)

I looked through the numbers and thought this:
In the second reaction, the K value is essentially based on CO(g) and CO2(g), because the pure solids have little/no effect on K. Looking at the reaction I am trying to find, I see that I am essentially finding K for H2O(g) <--> H2(g), because the pure solids do not affect the K value. With this knowledge, I subtracted the K value for [essentially] CO(g)<-->CO2(g) from the K value for H2O(g) + CO(g)<-->H2(g) + CO2(g), leaving me with the K value of H2O(g)<-->H2(g) [or .93]. Does this make sense?

No, it doens't.
H2O(g) + CO(g) <-> H2(g)+CO2(g) K= 1.6
FeO(s) + CO(g) <-> Fe(s)+ CO2(g) K=0.67

Call the first equation #1 and the second #2.
Reverse equation 2. K for that reversed is 1/K = 1/0.67.

Now add equation #1 to the reversed equation #2 to obtain the reaction you want. When adding equations, multiply Ks. So (1/0.67)x 1.6 = K for the final reaction.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chem - Calculate the Keq of the reversible reactions Cr2O7 + 2OH -> CrO4 + ...
Chemistry - Calculate the enthalpy change for the reaction 2C + H2 yield C2H2 ...
statistics - in a classic study of problem solving, katona demonstrated that ...
Chemistry - Calculate K at 25C for the reactions given below. (a) Zn(s) + 2Ag+(...
Chemistry - Calculate K at 25C for the reactions given below. (a) Zn(s) + 2Ag+(...
Algebra - Determine whether the given numbers are solutions of the inequality. t...
Geometry (Logic) - Which argument is not valid? 1.) Given: a→b a ...
Chemistry - Given the reaction 2 Na2 02 (s) + 2 H2o(i) - 4 NaOH(s) + 02(g) ...
Algebra II - How would you go about doing this problem? I've tried and with the ...
Chemistry - Calculate the enthalpy change of formation for the following ...

Members