Chapter 4, Problem 4D.6AST

Interpretation Introduction

Interpretation:

Thestandard enthalpy of formation of ethyne has to be determined.

Concept Introduction:

The difference in enthalpies of product and reactant species in a reaction is called enthalpy change $\left(\Delta H\right)$.  If the difference is negative, the reaction is said to be exothermic.  The value of $\Delta H_{\text{rxn}}^{\text{ο}}$ is determined by using,

  $\Delta H_{\text{rxn}}^{\text{ο}}={\displaystyle \sum m\cdot H_{\text{f}}{}^{\text{ο}}}\left(\text{products}\right)-{\displaystyle \sum n\cdot H_{\text{f}}{}^{\text{ο}}}\left(\text{reactants}\right)$