GENERAL CHEMISTRY(LL)-W/MASTERINGCHEM.
11th Edition
ISBN: 9780134566030
Author: Petrucci
Publisher: PEARSON
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Chapter 21, Problem 4E
Describe two methods for determining the identity of an unknown compound that is either
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The equation for the formation of fluorapatite, a crystal precursor during the
production of phosphorus, is as follows: xCa3(PO4)2 + CaF2→ 2Cas(PO4)3F. If the
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22. Copper is obtained from sulfide ores through a two-step process consisting
of roasting the ore in the presence of oxygen and heating the resultant copper(I)
oxide with powdered carbon. The overall reaction is as follows:
2Cu2S (s) + 302 (g) + 2C (s) → 2SO2 (g) + 4Cu (s) + 2CO (g)
Calculate the maximum yield of copper obtained from 1.60 kg of Cu2S.
(Relative atomic mass: S, 32; O, 16; C, 12; Cu, 64)
A. 0.26 kg
В. 0.64 kg
С. 0.96 kg
D. 1.28 kg
Consider the precipitation reaction that takes place when a water solution
of aluminum nitrate, Al(NO3)3, is added to a water solution of potassium phosphate, K3PO4.
Write a balanced equation for this reaction.
What is the maximum mass of aluminum phosphate that will precipitate
from a solution prepared by adding an excess of an Al(NO3)3 solution to
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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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- 4.48 Elemental phosphorous is used in the semiconductor industry. It can be obtained from an ore called fluoroapatite via reaction with SiO2 and C: 4Ca5( PO4)3F+18SiO2+30C3P4+30CO+18CaSiO3+2CaF2 Suppose a particular semiconductor production plant requires 1500 kg of P4. If the recovery of P4 from this reaction is 73% efficient, what mass of fluoroapatite is needed?arrow_forwardPhosphate buffers are important in regulating the pH of intracellular fluids. If the concentration ratio of H2PO4/HPO42 in a sample of intracellular fluid is 1.1: 1, what is the pH of this sample of intracellular fluid? H2PO4(aq)HPO42(aq)+H+(aq)Ka=6.2108arrow_forwardThe reaction of elemental phosphorus and excess oxygen produces P4O10. Name the compound. (a) phosphorus oxide (b) phosphoric acid (c) phosphorus decaoxide (d) tetraphosphorus decaoxidearrow_forward
- What is the mass of fish, in kilograms, that one would have to consume to obtain a fatal dose of mercury, if the fish contains 30 parts per million of mercury by weight? (Assume that all the mercury from the fish ends up as mercury (II) chloride in the body and that a fatal dose is 0.20 g of HgCl2.) How many pounds of fish is this?arrow_forwardPhosphorus occurs naturally in the form of fluorapatite, CaF2 3Ca3(PO4)2. The dot indicates 1 part CaF2 to 3 parts Ca3(PO4)2. This mineral is reacted with an aqueous solution of H2SO4 in the preparation of a fertilizer. The products are phosphoric acid, hydrogen fluoride, and gypsum, CaSO4 2H2O. Write the balanced equation describing this process.arrow_forwardIron forms a sulfide with the approximate formula Fe7S8. Assume that the oxidation state of sulfur is 2 and that iron atoms exist in both +2 and +3 oxidation states. What is the ratio of Fe(II) atoms to Fe(III) atoms in this compound?arrow_forward
- Azurite is a copper-containing mineral that often forms beautiful crystals. Its formula is Cu3(CO3)2(OH)2. Write balanced equation for the reaction of this mineral with hydrochloric acid.arrow_forwardCu(OH)2(s) → CuO(s)+H2O(l) write the name of the product and the name of the solid product.arrow_forwardBarium chloride + sodium carbonatearrow_forward
- 2. (Balance the equation) FeCl+NaOH>Fe(OH);+Naclarrow_forward7. The zirconium oxalate K,Zr(C204)3(H2C204) · H20 was synthesized by mixing 1.68 g of ZroCl2 · 8H20 with 5.20 g of H2C204 · 2H20 and an excess of aqueous KOH. After 2 months, 1.25 g of crystalline product was obtained, as well as aqueous KCl and water. Calculate the percent yield.arrow_forwardb. (i) (ii) A green solid has the empirical formula FeBr3·5NH3 H₂O. Upon reaction with an excess of aqueous AgNO3 it is found that 1 mole of the solid precipitates 3 moles of AgBr. Heating the green solid leads to loss of 1 mole of H₂O to yield a blue solid with the same ratio of Fe:Br:NH3 as found in the green solid. The reaction of 1 mole of the blue solid with excess of aqueous AgNO3 produces 2 moles of AgBr. Draw and name the octahedral green and blue complexes. An octahedral complex having the formula [M(dien)(NH3)(OH₂)F] has a total of 15 isomers. In the sum formula "dien" represents the tridentate diethylenetriamine ligand, which can adopt meridional or facial coordination modes. Draw structures of 8 possible isomers, clearly showing any pairs of enantiomers. The tridentante ligand may be abbreviated as below for simplicity. H₂N : = ΝΗ NH :NH2 N diethylenetriamine (dien) N Narrow_forward
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