
Interpretation:
Whether the standard enthalpy of the reaction is equal to the standard enthalpy of formation or not is to be determined.
Concept introduction:
The standard enthalpy of a reaction is the amount of enthalpy to occur under standard conditions.
The standard enthalpy of a reaction can be determined using the equation given below:
Here, the
The value of enthalpy of the formation of an element is zero at its most stable state.

Answer to Problem 87AP
Solution:
(a)
(b)
(c)
(d)
Explanation of Solution
a)
The reaction is given as follows:
Hydrogen in its
For the given equation, the enthalpy of the reaction is as follows:
The enthalpy of formation is zero for
Hence, for the reaction
b)
The reaction is given as follows:
Oxygen in its
For the given equation, the enthalpy of the reaction is as follows:
The enthalpy of formation is zero for
Hence, for the reaction
c)
The reaction is given as follows:
Hydrogen in its
For the given equation, the enthalpy of the reaction is as follows:
The enthalpy of formation is zero for
Hence, for the reaction
d)
The reaction is given as follows:
Oxygen is in its diatomic form, that is,
For the given equation, the enthalpy of the reaction is as follows:
The enthalpy of formation is zero for
Hence, for the reaction
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