Interpretation: The enthalpy change for the formation of phosphorus pentachloride is to be calculated.
Concept Introduction: Hess’s Law states that the overall change in enthalpy for the solution is the sum of all changes independent of the different phases or steps of a reaction.
Answer to Problem 78A
The enthalpy changes for the reaction
Explanation of Solution
The
The thermochemical equations given are
To get the required chemical reaction, first we must reverse the reaction
Now we have to multiply the reaction
Now adding the two reactions
The enthalpy change for the reaction
Chapter 17 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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