Textbook Question
Describe the structure of diborane (B2H6) and explain why the bridging B–H bonds are longer than the terminal B–H bonds.
23. Chemistry of the Nonmetals
Boron Family: Borane
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The formation of diborane from its elemental components is given below:
Determine the enthalpy value for the formation of diborane when given the enthalpy values for the following partial reactions:
A
+36 kJ
B
–3550 kJ
C
+520 kJ
D
+27 kJ
E
–171 kJ
Verified step by step guidance1
Identify the target reaction for the formation of diborane (B2H6) from its elements: 2B(s) + 3H2(g) -> B2H6(g).
List the given partial reactions and their enthalpy changes. These reactions will be used to construct the target reaction.
Use Hess's Law, which states that the total enthalpy change for a reaction is the sum of the enthalpy changes for each step, to combine the given reactions to form the target reaction.
Adjust the stoichiometry of the given reactions if necessary, ensuring that the sum of the reactions results in the formation of diborane from its elements.
Sum the enthalpy changes of the adjusted reactions to find the enthalpy change for the formation of diborane.
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