Although nitrogen trifluoride (NF3) is a thermally stable compound, nitrogen triodide (N I3) is

step 1 So the reaction we have here is BN solid plus 3 iF gas, BF3 gas, and N .I3 gas. So we are trying

Although nitrogen trifluoride (NF3) is a thermally stable...

Although nitrogen trifluoride $\left(\mathrm{NF}_{3}\right)$ is a thermally stable compound, nitrogen triodide $\left(\mathrm{N} \mathrm{I}_{3}\right)$ is known to be a highly explosive material. $\mathrm{NI}_{3}$ can be synthesized according to the equation $$ \mathrm{BN}(s)+3 \mathrm{IF}(g) \longrightarrow \mathrm{BF}_{3}(g)+\mathrm{NI}_{3}(g) $$ a. What is the enthalpy of formation for $\mathrm{NI}_{3}(s)$ given the enthalpy of reaction $(-307 \mathrm{kJ})$ and the enthalpies of formation for $\mathrm{BN}(s)(-254 \mathrm{kJ} / \mathrm{mol}), \operatorname{IF}(g)(-96 \mathrm{kJ} / \mathrm{mol})$ and $\mathrm{BF}_{3}(g)(-1136 \mathrm{kJ} / \mathrm{mol}) ?$ b. It is reported that when the synthesis of $\mathrm{NI}_{3}$ is conducted using 4 moles of IF for every 1 $\mathrm{mole}$ of $\mathrm{BN}$ , one of the by-products isolated is $\left[\mathrm{IF}_{2}\right]^{+}\left[\mathrm{BF}_{4}\right]^{-} .$ What are the molecular geometries of the species in this by-product? What are the hybridizations of the central atoms in each species in the by-product?

Although nitrogen trifluoride $\left(\mathrm{NF}_{3}\right)$ is a thermally stable compound, nitrogen triodide $\left(\mathrm{N} \mathrm{I}_{3}\right)$ is known to be a highly explosive material. $\mathrm{NI}_{3}$ can be synthesized according to the equation
$$
\mathrm{BN}(s)+3 \mathrm{IF}(g) \longrightarrow \mathrm{BF}_{3}(g)+\mathrm{NI}_{3}(g)
$$
a. What is the enthalpy of formation for $\mathrm{NI}_{3}(s)$ given the enthalpy of reaction $(-307 \mathrm{kJ})$ and the enthalpies of formation for $\mathrm{BN}(s)(-254 \mathrm{kJ} / \mathrm{mol}), \operatorname{IF}(g)(-96 \mathrm{kJ} / \mathrm{mol})$ and $\mathrm{BF}_{3}(g)(-1136 \mathrm{kJ} / \mathrm{mol}) ?$
b. It is reported that when the synthesis of $\mathrm{NI}_{3}$ is conducted using 4 moles of IF for every 1 $\mathrm{mole}$ of $\mathrm{BN}$ , one of the by-products isolated is $\left[\mathrm{IF}_{2}\right]^{+}\left[\mathrm{BF}_{4}\right]^{-} .$ What are the molecular geometries of the species in this by-product? What are the hybridizations of the central atoms in each species in the by-product?

Key Concepts

Standard Enthalpy of Formation

This concept refers to the change in enthalpy when one mole of a compound is formed from its elements in their standard states under standard conditions. It is a fundamental thermodynamic quantity used as a reference to calculate the overall enthalpy changes in chemical reactions by considering how much energy is involved in forming each compound from its constituent elements.

Hess’s Law

Hess’s Law states that the total enthalpy change during the complete course of a chemical reaction is independent of the route by which the chemical change occurs, provided the initial and final conditions are the same. It allows one to calculate the overall reaction enthalpy by summing the enthalpies of formation (or reaction) of the reactants and products, thus facilitating the determination of unknown enthalpy changes in reaction pathways.

VSEPR Theory for Molecular Geometry

The Valence Shell Electron Pair Repulsion (VSEPR) theory is used to predict molecular geometries by considering the electron pairs surrounding a central atom and their mutual repulsions. According to VSEPR theory, electron pairs, whether in bonds or as lone pairs, will arrange themselves as far apart as possible to minimize repulsion, leading to specific three-dimensional shapes that influence the properties and reactivities of molecules.

Hybridization

Hybridization is a concept in orbital theory where atomic orbitals mix to form new, degenerate orbitals that are better suited for describing the geometric arrangement of atoms in a molecule. The type of hybridization (such as sp, sp2, or sp3) typically correlates with the molecular geometry predicted by VSEPR theory and helps to explain the bonding and structure of molecules by accounting for the equivalence of bonds in a specific molecular shape.

Transcript

Please give Ace some feedback