Wednesday

October 22, 2014

October 22, 2014

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

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**

**Related Questions**

Algebra - Slove each system by substitution. 4x = y - 1 6x - 2y = -3 I have ...

Math - Working on a problem and can't figure out how the book rearranged this ...

Math - Can someone explain this problem to me, I cannot figure out how they came...

college-- chemistry - This problem really bugs me and I did figure out the ...

Algebra - Hi! Today I was absent from my algebra class, and they learned how to ...

statistics - in a classic study of problem solving, katona demonstrated that ...

chem - how many milliter of .246 M HNO3 should be added to 213 ml of 0.00666 M 2...

Algebra II - How would you go about doing this problem? I've tried and with the ...

Math - Could someone please explain this problem to me? I will show you what I ...

explaining math problems - It is hard for me to figure out it the math sentence ...