Interpretation: The value of change in enthalpy of the given reaction needs to be calculated using Hess’s law and two thermochemical equations.
Concept Introduction: According to Hess’s law, the total enthalpy change for a complete reaction is equal to the sum of the enthalpy change of all the steps involved in the reaction. This is because enthalpy is a state function.
Explanation of Solution
The given reaction for which change in enthalpy needs to be calculated is as follows:
The two thermochemical equations are as follows:
The following reaction shows the production of hydrogen after the reaction of methane and water vapor.
Now, when carbon monoxide reacts with the added stream, more hydrogen is produced as follows:
The given reaction can be obtained by adding reactions (1) and (2) as follows:
Therefore, the change in enthalpy for the given reaction is
Chapter 17 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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