At
(a)
Calculate the standard enthalpy of neutralisation of
(b)
Using the value of -56.2 kJ as the standard enthalpy change for the reaction
calculate the standard enthalpy change for the reaction
Interpretation:
The standard enthalpy of neutralization for the given compound and the standard enthalpy change for the given reaction are to be calculated.
Concept introduction:
The standard enthalpy for a reaction is the amount of enthalpy that occurs under standard conditions.
The standard enthalpy of a reaction is determined by using the equation given below:
Here, the stoichiometric coefficients are represented by m for the reactants and n for the products and the enthalpy of formation under standard conditions is represented by
The value of the enthalpy of formation of an element is zero at its most stable state.
Answer to Problem 98AP
Solution:
(a)
(b)
Explanation of Solution
Given information:
a) The standard enthalpy of neutralization of
The given reaction is as follows:
Calculate the enthalpy of neutralization for the given reaction as follows:
Substitute
Hence, the enthalpy of neutralization for
b) The standard enthalpy change for the reaction
The given reaction with its enthalpy of reaction is as follows:
Calculate the standard enthalpy of reaction as follows:
Substitute
Rearrange the above equation for
as follows:
The reaction of hydrogen fluoride is as follows:
Calculate the standard enthalpy of the reaction as follows:
Substitute
Hence, the required enthalpy of reaction is
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