Chapter 4, Problem 4.1NP

Interpretation Introduction

Interpretation:

The single bond enthalpies and energies should be calculated for $\text{Si}-\text{F}$ , $\text{Si}-\text{Cl}$ , $\text{C}-\text{F}$ , $\text{N}-\text{F}$ , $\text{O}-\text{F}$ , $\text{H}-\text{F}$ .

Substance	$Si{F}_4(g)$	$SiC{l}_4(g)$	$C{F}_4(g)$	$N{F}_3(g)$	$O{F}_2(g)$	$HF(g)$
$\Delta H_f^o$	-1614.9	-657.0	-925	-125	-22	-271

Concept Introduction:

The mathematical expression for the standard enthalpy change is:

According to Hess’s law,

  $\Delta {\text{H}}^o=\Delta {\text{H}}_1^o+\Delta {\text{H}}_2^o+\Delta {\text{H}}_3^o$

The mathematical expression for standard internal energychange is:

  $\Delta H^o=\Delta U^o+\Delta PV$

  $\Delta U^o=\Delta H^o-\Delta nRT$