Choose the ionic compound that would have the larger lattice energy: ( a ) LiBr or CaBr 2 , ( b ) LiF or KF, ( c ) CaO or BaS . ( Hint: What two factors affect lattice energy?)
Choose the ionic compound that would have the larger lattice energy: ( a ) LiBr or CaBr 2 , ( b ) LiF or KF, ( c ) CaO or BaS . ( Hint: What two factors affect lattice energy?)
Choose the ionic compound that would have the larger lattice energy:
(
a
)
LiBr or CaBr
2
,
(
b
)
LiF or KF,
(
c
)
CaO or BaS
.
(Hint: What two factors affect lattice energy?)
Expert Solution & Answer
Interpretation Introduction
Interpretation:
The ionic compound that has the larger lattice energy from the given compounds is to be identified.
Concept Introduction:
An ionic compound is a compound in which positive and negative ions are held together by electrostatic forces.
Lattice energy is the energy that is liberated when ions are linked together in order to form a compound.
Lattice energy increases with the increase in the charge of the ions and the decrease in the size of the ions.
Answer to Problem 1PE
Solution:
a) CaBr2
b) LiF
c) CaO
Explanation of Solution
a) LiBr or CaBr2
When the charges on the ions become greater, the potential energy is considered to be lower that leads to a larger lattice energy. The ionic compound CaBr2 carries a greater charge than the ionic compound LiBr, which means CaBr2 contains larger lattice energy.
b) LiF or KF
When the size of the ions become smaller, the potential energy is considered to be higher that leads to a larger lattice energy. The ionic compound LiF has a smaller size than the ionic compound KF, which means LiF contains larger lattice energy.
c) CaO or BaS
When the charges on the ions become greater, the potential energy is considered to be higher that leads to a larger lattice energy. The ionic compound CaO carries a greater charge than the ionic compound BaS because the Oxygen atom has more charge than the Sulphur atom, which means CaO contains larger lattice energy.
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MISSED THIS? Read Section 19.9 (Pages 878-881); Watch IWE 19.10
Consider the following reaction:
CH3OH(g)
CO(g) + 2H2(g)
(Note that AG,CH3OH(g) = -162.3 kJ/mol and AG,co(g)=-137.2 kJ/mol.)
Part A
Calculate AG for this reaction at 25 °C under the following conditions:
PCH₂OH
Pco
PH2
0.815 atm
=
0.140 atm
0.170 atm
Express your answer in kilojoules to three significant figures.
Ο ΑΣΦ
AG = -150
Submit
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Calculate the free energy change under nonstandard conditions (AGrxn) by using the following relationship:
AGrxn = AGrxn + RTInQ,
AGxn+RTInQ,
where AGxn is the standard free energy change, R is the ideal gas constant, T is the temperature in kelvins, a
is the reaction quotient.
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