To determine the B − N bond length in the given cubic lattice. Concept introduction: There are two types of the cubic lattice of ZnS , zinc-blende and wurtzite. Zinc blende is based on a face-centred cubic lattice of anions and cations occupying one-half of the tetrahedral holes. Each ion is four coordinate and has local tetrahedral geometry. If one constituent particles lie at the centre of each face and the particles lying at the centre is known as a face-centred cubic lattice. The density of unit-cell is expressed as, D = n × M N A × a 3 g ⋅ cm − 3 (1) Here, The density of unit cell is denoted by D The number of atoms is denoted by n The molar mass of each atom in the unit-cell is denoted by M The Avogadro number is denoted by N A The bond-length is denoted by a Bond length is the distance between the nuclei in a bond and it is related to the sum of the covalent radii at the bonded atoms.
To determine the B − N bond length in the given cubic lattice. Concept introduction: There are two types of the cubic lattice of ZnS , zinc-blende and wurtzite. Zinc blende is based on a face-centred cubic lattice of anions and cations occupying one-half of the tetrahedral holes. Each ion is four coordinate and has local tetrahedral geometry. If one constituent particles lie at the centre of each face and the particles lying at the centre is known as a face-centred cubic lattice. The density of unit-cell is expressed as, D = n × M N A × a 3 g ⋅ cm − 3 (1) Here, The density of unit cell is denoted by D The number of atoms is denoted by n The molar mass of each atom in the unit-cell is denoted by M The Avogadro number is denoted by N A The bond-length is denoted by a Bond length is the distance between the nuclei in a bond and it is related to the sum of the covalent radii at the bonded atoms.
Solution Summary: The author describes the cubic lattice of ZnS, which consists of anions and cations occupying one-half of tetrahedral holes.
Definition Definition Number of atoms/molecules present in one mole of any substance. Avogadro's number is a constant. Its value is 6.02214076 × 10 23 per mole.
Chapter 21, Problem 130SCQ
Interpretation Introduction
Interpretation:
To determine the B−N bond length in the given cubic lattice.
Concept introduction:
There are two types of the cubic lattice of ZnS, zinc-blende and wurtzite. Zinc blende is based on a face-centred cubic lattice of anions and cations occupying one-half of the tetrahedral holes. Each ion is four coordinate and has local tetrahedral geometry.
If one constituent particles lie at the centre of each face and the particles lying at the centre is known as a face-centred cubic lattice.
The density of unit-cell is expressed as,
D=n×MNA×a3g⋅cm−3 (1)
Here,
The density of unit cell is denoted by D
The number of atoms is denoted by n
The molar mass of each atom in the unit-cell is denoted by M
The Avogadro number is denoted by NA
The bond-length is denoted by a
Bond length is the distance between the nuclei in a bond and it is related to the sum of the covalent radii at the bonded atoms.
Answer the questions in the table below about the shape of the borane (BH3) molecule.
How many electron groups are around the central boron atom?
Note: one "electron group" means one lone pair, one single bond,
one double bond, or one triple bond.
What phrase best describes the arrangement of these electron
groups around the central boron atom?
(You may need to use the scrollbar to see all the choices.)
(choose one)
X
G
<
What is the lewis structure for SiO2?
4. The common oxidation number for an alkaline earth metal is +2.
(a) Using the Born-Mayer equation (for determining the lattice enthalpy) and a Born-Haber
cycle (draw it), show that CaCl is an exothermic compound (negative AHf). Make a
reasonable prediction to estimate the ionic radius of Ca (explain your reasoning). The
sublimation (atomization) enthalpy for Ca(s) is 178 kJ/mol.
(b) Show that an explanation for the non-existence of CaCl can be found in the enthalpy
change for the reaction below. The AHf for CaCl2(s) is -190.2 kcal/mol.
2 CaCl(s) → Ca(s) + CaCl2(s)