Calculate a lattice energy for CaH 2 ( s ) in kilojoules per mole using the following information E ea for H ( g ) = − 72 . 8 kJ/mol E i1 for Ca ( g ) = + 589 . 8 kJ/mol E i2 for Ca ( g ) = + 1145 kJ/mol Heat of sublimation for Ca ( s ) = + 178 . 2 kJ/mol Bond dissociation energy for H 2 ( g ) = + 435 . 9 kJ/mol Net energy change for the formation of CaH 2 ( s ) from itselements = − 186 . 2 kJ / mol
Calculate a lattice energy for CaH 2 ( s ) in kilojoules per mole using the following information E ea for H ( g ) = − 72 . 8 kJ/mol E i1 for Ca ( g ) = + 589 . 8 kJ/mol E i2 for Ca ( g ) = + 1145 kJ/mol Heat of sublimation for Ca ( s ) = + 178 . 2 kJ/mol Bond dissociation energy for H 2 ( g ) = + 435 . 9 kJ/mol Net energy change for the formation of CaH 2 ( s ) from itselements = − 186 . 2 kJ / mol
Solution Summary: The author describes the Born-Haber cycle of ionic solids from its constituent elements.
Calculate a lattice energy for
CaH
2
(
s
)
in kilojoules per mole using the following information
E
ea
for H
(
g
)
=
−
72
.
8 kJ/mol
E
i1
for Ca
(
g
)
=
+
589
.
8 kJ/mol
E
i2
for Ca
(
g
)
=
+
1145 kJ/mol
Heat of sublimation for Ca
(
s
)
=
+
178
.
2 kJ/mol
Bond dissociation energy for H
2
(
g
)
=
+
435
.
9 kJ/mol
Net energy change for the formation of CaH
2
(
s
)
from itselements
=
−
186
.
2 kJ
/
mol
In the solid state, oxalic acid occurs as
a dihydrate with the formula H2C2O4
C+2H2O. Use this formula to
calculate the formula weight of oxalic
acid. Use the calculated formula
weight and the number of moles
(0.00504mol)
of oxalic acid in each titrated
unknown sample recorded in Table
6.4 to calculate the number of grams
of pure oxalic acid dihydrate
contained in each titrated unknown
sample.
1.
Consider a pair of elements with 2p and 4p valence orbitals (e.g., N and Se). Draw their
(2p and 4p AO's) radial probability plots, and sketch their angular profiles. Then, consider these
orbitals from the two atoms forming a homonuclear л-bond. Which element would have a
stronger bond, and why?
(4 points)
Write the reaction and show the mechanism of the reaction. Include the mechanism
for formation of the NO2+
2. Explain, using resonance structures, why the meta isomer is formed. Draw possible
resonance structures for ortho, meta and para.
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