Introductory Chemistry: A Foundation
9th Edition
ISBN: 9781337399425
Author: Steven S. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Chapter 6, Problem 74AP
Interpretation Introduction
Interpretation:
The balanced chemical equation for the given reaction should be determined.
Concept Introduction:
The balanced reaction is that
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Balance the following equations. (Use the lowest possible whole-number coefficients. These may be zero.)
(a) Fe(CN)6³(aq) + N₂H5+ (aq) Fe(CN) 6+ (aq) + N₂(g)
4
+0
5
0
(b) Clo (aq) + I₂(s) ⇒ Cl(aq) + 10₂ (aq)
Fe(CN)6³ +7
H₂O
2
CIO +1
H₂O
OH +
(c) Cro4² (aq) + C₂042 (aq) = Cr(OH)3(s) + CO₂(g)
CrO4² +1
OH +0
XN₂H5 +0
X Tl₂O3 +
H₂O
X H₂O
1₂ +0
(d) Tl₂O3(s) + NH₂OH(aq) = TIOH(s) + N₂(g)
XC₂04² +0
X NH₂OH +
H+ + 0
H+ +1
OH +8
X OH +
H₂O 4
H₂O=5
H₂O = 2
| H2O=
Fe(CN) 64 + 7
CI + 2
Cr(OH)3 + 2
X TIOH(s) +
XN₂ + 35
103 +2
* H*
XN₂ +
H+ +
X CO₂ + 10
X
Many mining operations produce tailings that can be oxidized to form acids, including sulfuric acid. One chemical that reacts in this way is chalcopyrite, CuFeS2, whose net oxidation can be
described by the following equation.
4 CuFeS2 (s) + 17 O2 (g) + 10 H20(1) → 4 Fe (OH); (s) + 4 CuSO4(ag) + 4 H2SO4(aq)
In a laboratory experiment to study weathering, a mining engineer put a 1.68 kg sample of CuFeS2 (s) near an empty 40 L container. Simulated weathering experiments were conducted and the
runoff was collected, leading to 35.7 L of solution. A 25.00 mL aliquot of this solution was analyzed with 0.0100 M NaOH(ag). The titration required 32.1 mL of base.
(a)
What was the concentration (in M) of sulfuric acid?
(b) Assuming the only acid in the container comes from the reacted chalcopyrite, what mass (in g) of the chalcopyrite has reacted?
(c)
What percentage of the chalcopyrite reacted in this experiment?
Lead (Pb) has been used for centuries. The Romans used it in their plumbing systems - the symbol for
lead (Pb
plumbus). To extract the metal, lead (II) sulfide (mineral galena) is roasted in air to form
lead (II) oxide (PbO):
2 PbS(s) + 3 O2(g)
→ 2 PbO(s) + 2 SO2(g)
AHrxn = -827.4 kJ
Then the lead (II) oxide is reduced with carbon to the metal lead:
PbO(s) + C(s)
Pb(s) +
СО (9)
AHrxn
= +106.8 kJ
a) Use the equations above and Hess's Law to determine the enthalpy of change for the
following reaction:
PbS(s) + /2 O2(g)
+ C(s)
→ Pb(s) + CO
(g)
SO2(g)
ΔΗη
[ Select ]
kJ (1 mol
PbS)
b) How much energy (kJ) absorbed (+AHxn) or evolved (-AHpxn) when 400.0 grams of lead (II) sulfide
(PbS(s) is converted to lead (Pb)?
ΔΗΡη
[ Select ]
kJ / 400.0 g
PbS
Chapter 6 Solutions
Introductory Chemistry: A Foundation
Ch. 6.2 - Prob. 6.1SCCh. 6.3 - Prob. 1CTCh. 6.3 - One part of the problem-solving strategy for...Ch. 6.3 - Prob. 6.2SCCh. 6.3 - Prob. 6.3SCCh. 6 - The following are actual student responses to the...Ch. 6 - Prob. 2ALQCh. 6 - Given the equation for the reaction:N2+H2NH3 ,...Ch. 6 - Prob. 4ALQCh. 6 - Can the subscripts in a chemical formula be...
Ch. 6 - Prob. 6ALQCh. 6 - Changing the subscripts of chemicals can...Ch. 6 - Table 6.1 lists some clues that a chemical...Ch. 6 - Use molecular-level drawings to show the...Ch. 6 - It is stated in Section 6.3 of the text that to...Ch. 6 - Prob. 11ALQCh. 6 - Consider the generic chemical equationaA+bBcC+dD...Ch. 6 - Prob. 13ALQCh. 6 - Which of the following correctly describes the...Ch. 6 - Which of the following correctly balances the...Ch. 6 - The reaction of an element X() with element Y() is...Ch. 6 - Prob. 1QAPCh. 6 - Prob. 2QAPCh. 6 - Although these days many people have...Ch. 6 - Prob. 4QAPCh. 6 - You have probably had the unpleasant experience of...Ch. 6 - If you’ve ever left bread in a toaster too long,...Ch. 6 - What are the substances to theleftof the arrow in...Ch. 6 - Prob. 8QAPCh. 6 - In a chemical reaction, the total number of atoms...Ch. 6 - Prob. 10QAPCh. 6 - Prob. 11QAPCh. 6 - The notation “(l)” after a substance’s formula...Ch. 6 - A common experiment to determine the relative...Ch. 6 - A common lecture demonstration called “elephant’s...Ch. 6 - If a sample of pure hydrogen gas is ignited very...Ch. 6 - Liquid hydrazine, has been used as a fuel for...Ch. 6 - If electricity of sufficient voltage is passed...Ch. 6 - Silver oxide may be decomposed by strong heating...Ch. 6 - Elemental boron is produced in one industrial...Ch. 6 - Many over-the-counter antacid tablets are now...Ch. 6 - Phosphorus trichloride is used in the manufacture...Ch. 6 - Pure silicon, which is needed in the manufacturing...Ch. 6 - Nitrous oxide gas (systematic name: dinitrogen...Ch. 6 - Solid zinc is added to an aqueous solution...Ch. 6 - Acetylene gas (C2H2) is often used by plumbers,...Ch. 6 - The burning of high-sulfur fuels has been shown to...Ch. 6 - The Group 2 metals (Ba, Ca, Sr) can be produced in...Ch. 6 - There are fears that the protective ozone layer...Ch. 6 - Carbon tetrachloride was widely used for many...Ch. 6 - When elemental phosphorus, P4, burns in oxygen...Ch. 6 - Calcium oxide is sometimes very challenging to...Ch. 6 - Prob. 32QAPCh. 6 - The element tin often occurs in nature as the...Ch. 6 - Nitric acid, HNO3 , can be produced by reacting...Ch. 6 - When balancing chemical equations, beginning...Ch. 6 - The “Chemistry in Focus” segment The Beetle That...Ch. 6 - Balance each of the following chemical equations....Ch. 6 - Balance the equations for the reaction of...Ch. 6 - Balance each of the following chemical equations....Ch. 6 - Balance each of the following chemical equations....Ch. 6 - Balance each of the following chemical equations....Ch. 6 - Prob. 42QAPCh. 6 - Prob. 43QAPCh. 6 - Prob. 44QAPCh. 6 - Acetylene gas, C2H2 , is used in welding because...Ch. 6 - When balancing a chemical equation, which of the...Ch. 6 - Crude gunpowders often contain a mixture of...Ch. 6 - The following demonstration takes place in a...Ch. 6 - Methanol (methyl alcohol), CH3OH , is a very...Ch. 6 - The Hall process is an important method by which...Ch. 6 - Iron oxide ores, commonly a mixture of FeO and...Ch. 6 - True or false? Coefficients can be fractions when...Ch. 6 - When steel wool (iron) is heated in pure oxygen...Ch. 6 - One method of producing hydrogen peroxide is to...Ch. 6 - When elemental boron, B, is burned in oxygen gas,...Ch. 6 - A common experiment in introductory chemistry...Ch. 6 - A common demonstration in chemistry courses...Ch. 6 - Write a balanced chemical equation for the...Ch. 6 - Prob. 59APCh. 6 - Prob. 60APCh. 6 - If you had a “sour stomach,” you might try an...Ch. 6 - When iron wire is heated in the presence of...Ch. 6 - When finely divided solid sodium is dropped into a...Ch. 6 - If aqueous solutions of potassium chromate and...Ch. 6 - When hydrogen sulfide, H2S , gas is bubbled...Ch. 6 - If an electric current is passed through aqueous...Ch. 6 - When a strip of magnesium metal is heated in...Ch. 6 - Prob. 68APCh. 6 - When solid red phosphorus, is burned in air, the...Ch. 6 - When copper (II) oxide is boiled in an aqueous...Ch. 6 - When lead(II) sulfide is heated lo high...Ch. 6 - Which of the following statements about chemical...Ch. 6 - Prob. 73APCh. 6 - Prob. 74APCh. 6 - Prob. 75APCh. 6 - Using different shapes to distinguish between...Ch. 6 - Which of the following statements about chemical...Ch. 6 - Prob. 78CPCh. 6 - Balance the following chemical equations....
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