
Interpretation:
The enthalpy change for the following reaction should be determined.
Concept Introduction:
Enthalpy of a reaction is a state function thus; change in enthalpy of a reaction does not depend on the path of the reaction.
The change in enthalpy is same if the same reaction takes place in one step or series of steps. This is known as Hess’s law. There are following characteristics of change in enthalpy which are important to calculate the change in enthalpy of a reaction using Hess’s law.
- For a reversed reaction, the sign of enthalpy change of the reaction also reversed.
- If any reactant or product is multiplied by any integer in the
chemical reaction , enthalpy change of that reactant or product is also multiplied by the same integer.

Answer to Problem 89CP
Explanation of Solution
Given Information:
The following reactions are given:
Calculation:
The net reaction is as follows:
To obtain the above reaction,
Reverse the 2nd reaction as follows:
Multiply the above reaction by 2
Adding the above reaction to 1st reaction thus,
Now, reverse the 3rd reaction:
Adding this reverse reaction to above net reaction:
The 4th reaction is multiplied by 9 thus,
Adding this to the above net reaction:
Divide the resultant reaction by 4 to get the desired reaction:
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Chapter 10 Solutions
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- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
