The bond lengths of the X − H bonds in NH 3 , PH 3 , and SbH 3 are 1.02, 1.42, and 1.71 Å, respectively. Estimate the length of the As − H bond in AsH 3 , the gaseous compound that decomposes on a heated glass surface in Marsh’s test for arsenic. Which of these four hydrides has the weakest X − H bond?
The bond lengths of the X − H bonds in NH 3 , PH 3 , and SbH 3 are 1.02, 1.42, and 1.71 Å, respectively. Estimate the length of the As − H bond in AsH 3 , the gaseous compound that decomposes on a heated glass surface in Marsh’s test for arsenic. Which of these four hydrides has the weakest X − H bond?
Solution Summary: The author explains that the length of the As-H bond in AsH 3 depends on the nuclear charge of an atom and its size. The bond strength is inversely proportional to the bond length.
The bond lengths of the
X
−
H
bonds in
NH
3
,
PH
3
, and
SbH
3
are 1.02, 1.42, and 1.71 Å, respectively. Estimate the length of the
As
−
H
bond in
AsH
3
, the gaseous compound that decomposes on a heated glass surface in Marsh’s test for arsenic. Which of these four hydrides has the weakest
X
−
H
bond?
Ammonia is an important chemical used in the
production of fertilizer. Industrial production of
ammonia from atmospheric nitrogen is difficult
because of the energy required to cleave the
N-N triple bond. Consider the balanced reaction
of ammonia: N2(g) + 3H2(g) → 2 NH3 (9).
This reaction has a value of K = 4.3 x 10-2 at 25
°C.
Part A
Estimate the AH for this reaction using bond energies.
Bond
Bond Dissociation
Energy
kcal/mol (kJ/mol)
N-H 93 (391)
N-N 38 (160)
H-H 103 (432)
N = N 226 (946)
Express your answer as an integer.
ΜΕ ΑΣΦ
?
kJ/mol
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
<
A nonmetal like oxygen forms both ionic and covalent bonds, depending on the identity of the element to which it bonds. What type of bonding is observed in CaO and CO 2? Explain why two different types of bonding are observed.
Chapter 3 Solutions
Bundle: Principles of Modern Chemistry, Loose-leaf Version, 8th + LMS Integrated for OWLv2 with MindTap Reader, 4 terms (24 months) Printed Access Card
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Quantum Molecular Orbital Theory (PChem Lecture: LCAO and gerade ungerade orbitals); Author: Prof Melko;https://www.youtube.com/watch?v=l59CGEstSGU;License: Standard YouTube License, CC-BY