GENERAL CHEMISTRY(LL)-W/MASTERINGCHEM.
11th Edition
ISBN: 9780134566030
Author: Petrucci
Publisher: PEARSON
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Chapter 21, Problem 76IAE
Would you expect the lattice energy of MgS(s) to be less than, greater than, or about the same as that of MgO(s)? Use appropriate data from various locations in this text to obtain the values of the two lattice energies. Use a value of 456 kJ mol-1 for the process
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Given the information below, calculate the lattice enthalpy for MX(s), where M is a group 1 metal, and X is a group 17 element (standard state: X2(g)).
ΔfH°(MX) = -462 kJ mol−1 ΔsubH°(M) = 127 kJ mol−1 D(X2) = 442 kJ mol−1 IE1(M) = 480 kJ mol−1 Eeg1(X) = -142 kJ mol−1 Express your answer to four significant figures.
ΔlattH°(MX) = Answer kJ mol−1
Alkali metals are often used to remove traces of water from organic solvents,
such as diethyl ether. Because the reaction (see below) releases heat, care
must be taken to make sure that the solvent does not "boil over".
2 Na(s) + 2 H₂O(1) ➜ 2 NaOH(aq) + H₂(g)
a) Determine the standard enthalpy change for this reaction. Comment on the
relative strength of bonding and/or interactions in the products vs reactants,
and briefly explain how you decided this.
Substance
Na(s)
H₂O(1)
NaOH(aq)
H₂(g)
AHºf (kJ/mol)
0
-285.83
-469.15
0
b) How much heat (in kJ) is released via the reaction of 1.00 g of sodium metal with water? If this much heat is
released into 275 g of diethyl ether initially at 25°C, will the solvent reach its boiling point? If so, how many
grams of the ether will evaporate? Show calculations to support your answer.
For diethyl ether: Cs = 2.51 J/g⋅K, b.p. = 35°C, heat of vaporization = 377 J/g.
Use heat of formation data from Appendix E to calculate the change in the standard heat of reaction for
ClO2(g)+O(g)⟶ClO(g)+O2(g)
Chapter 21 Solutions
GENERAL CHEMISTRY(LL)-W/MASTERINGCHEM.
Ch. 21 - Prob. 1ECh. 21 - Use information from the chapter to write chemical...Ch. 21 - Prob. 3ECh. 21 - Describe two methods for determining the identity...Ch. 21 - Arrange the following compounds in the expected...Ch. 21 - Prob. 6ECh. 21 - Prob. 7ECh. 21 - A lithium battery used in a cardiac pacemaker has...Ch. 21 - Prob. 9ECh. 21 - Prob. 10E
Ch. 21 - The standard Gibbs energies of formation, rG , for...Ch. 21 - Prob. 12ECh. 21 - Prob. 13ECh. 21 - Prob. 14ECh. 21 - Prob. 15ECh. 21 - Prob. 16ECh. 21 - Prob. 17ECh. 21 - Write chemical equations for the reactions you...Ch. 21 - Without performing detailed calculations, indicate...Ch. 21 - Prob. 20ECh. 21 - With respect to decomposition to MO(s) and SO2(g)...Ch. 21 - Prob. 22ECh. 21 - Prob. 23ECh. 21 - Prob. 24ECh. 21 - Prob. 25ECh. 21 - Prob. 26ECh. 21 - Prob. 27ECh. 21 - Prob. 28ECh. 21 - Prob. 29ECh. 21 - Prob. 30ECh. 21 - Prob. 31ECh. 21 - Prob. 32ECh. 21 - Prob. 33ECh. 21 - Prob. 34ECh. 21 - Prob. 35ECh. 21 - Prob. 36ECh. 21 - Prob. 37ECh. 21 - Prob. 38ECh. 21 - Prob. 39ECh. 21 - Prob. 40ECh. 21 - Prob. 41ECh. 21 - Prob. 42ECh. 21 - Prob. 43ECh. 21 - Prob. 44ECh. 21 - Methane and sulfur vapor react to form carbon...Ch. 21 - Prob. 46ECh. 21 - Prob. 47ECh. 21 - Prob. 48ECh. 21 - Write plausible chemical equations for the (a)...Ch. 21 - Prob. 50ECh. 21 - Prob. 51ECh. 21 - Aqueous tin(II) ion, Sn2+(aq) , is a good reducing...Ch. 21 - Would you expect the reaction of Sn(s) and Cl2(g)...Ch. 21 - Prob. 54ECh. 21 - Prob. 55IAECh. 21 - The following series of observations is made: (1)...Ch. 21 - Prob. 57IAECh. 21 - Prob. 58IAECh. 21 - Prob. 59IAECh. 21 - Prob. 60IAECh. 21 - Lithium superoxide, LiO2(s) , has never been...Ch. 21 - Prob. 62IAECh. 21 - Prob. 63IAECh. 21 - Prob. 64IAECh. 21 - Use data from Appendix D (Table D-2) to calculate...Ch. 21 - Prob. 66IAECh. 21 - A particular water sample contains 56.9 ppm SO42-...Ch. 21 - An aluminum production cell of the type pictured...Ch. 21 - Prob. 69IAECh. 21 - Prob. 70IAECh. 21 - Prob. 71IAECh. 21 - Prob. 72IAECh. 21 - Prob. 73IAECh. 21 - Prob. 74IAECh. 21 - Prob. 75IAECh. 21 - Would you expect the lattice energy of MgS(s) to...Ch. 21 - Prob. 77IAECh. 21 - Prob. 78FPCh. 21 - Prob. 79FPCh. 21 - Prob. 80SAECh. 21 - Briefly describe each of the following ideas,...Ch. 21 - Explain the important distinction between each...Ch. 21 - Prob. 83SAECh. 21 - Prob. 84SAECh. 21 - Predict the products of the following reactions:...Ch. 21 - A chemist knows that aluminum is more reactive...Ch. 21 - Listed are several pairs of substances. For some...Ch. 21 - Prob. 88SAECh. 21 - Prob. 89SAECh. 21 - Prob. 90SAECh. 21 - Prob. 91SAECh. 21 - Prob. 92SAECh. 21 - Prob. 93SAECh. 21 - Prob. 94SAECh. 21 - Prob. 95SAE
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