Chapter 4, Problem 77QRT

(a)

Interpretation Introduction

Interpretation:

The standard formation enthalpy of aluminum oxide has to be calculated.

Concept introduction:

The expression for the enthalpy change is:

  ${\text{Δ}}_{\text{r}}{\text{H}}^{\text{°}}\text{= }\sum {\text{nΔ}}_{\text{f}}{\text{H}}^{\text{°}}\left(\text{products}\right)\text{-}\sum {\text{nΔ}}_{\text{f}}{\text{H}}^{\text{°}}\left(\text{reactants}\right)$

(b)

Interpretation Introduction

Interpretation:

For $12.50\text{ g}$ formation of aluminum oxide, the energy transfer has to be calculated.