Chapter 5, Problem 5.104AP

Interpretation Introduction

Interpretation: The standard enthalpy of formation of ethyne is to be calculated.

Concept introduction: The energy change for the formation of one mole of a compound in its standard state that is $1\text{atm}$ pressure and $298.15\text{K}$ temperature is known as the standard enthalpy of the reaction. This is also known as heat of reaction and denoted by the symbol $\Delta H_{\text{reaction}}^{°}$. It is also defined as the enthalpy change during the transformation of matter in a specific chemical reaction. In case of formation the enthalpy change is denote by the symbol $\Delta H_{\text{f}}^{°}$. In case of combustion reaction the enthalpy change is denote by the symbol $\Delta H_{\text{combustion}}^{°}$. In such type of reactions all the reactants and the products should be in their standard state. The standard enthalpy of the reactions follows the same balancing conditions as followed by the desired reaction. The combustion is the process in which a reactant is reacted with the sufficient supply of oxygen gas.

To determine: The standard enthalpy of formation of ethyne.