Chapter 2, Problem 2C.4P

Interpretation Introduction

Interpretation: The value for the standard enthalpy of formation of diborane, ${\text{B}}_{\text{2}}{\text{H}}_{\text{6}}\left(\text{g}\right)$ at $2\text{98 K}$ has to be calculated.

Concept introduction: Enthalpy is the internal heat content of the system.  Under constant pressure, a system can do expansion work under the effect of energy supplied as heat known as enthalpy change of the system.  The measure of amount of heat supplied to the system gives the enthalpy change of the system.