Number 81.  I can write balance equation and part A I did easily.  I do not understand how they can't answer for B? and I even looked at the solution book and I don't know how they're adding water as a reaction.  Feel free to see oic of solution to get the delta H.   the question has three equations, yet the solution Book uses foour:  I just don't know how They got answer

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Number 81.  I can write balance equation and part A I did easily.  I do not understand how they can't answer for B? and I even looked at the solution book and I don't know how they're adding water as a reaction.  Feel free to see oic of solution to get the delta H.  

the question has three equations, yet the solution Book uses foour:  I just don't know how They got answer 

Expert Solution
Step 1

For part b, in question it is mentioned that the water is present as a product in the overall reaction.

And since in step 3, the water is present in liquid phase while in step 1 its in gaseous phase.

Hence while adding the steps to get overall reaction, we can not cancel H2O (g) with H2O (l).

Hence to cancel the H2O (l) from the reactant side, we need to use a 4th equation i.e condensation of water.

Please find below the steps to get the final answer.

 

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