The first step in the extraction of copper metal from its ore is shown below. The numbers beneath each formula are the molar mass, M, (units of grams/mole) and the enthalpy of formation, AfH°, (units of kilojoules/mole) of that substance. 4 CuFeS2(s) + 9 O2(8) → 2 Cu2s (s) + 2 Fe2O3(s) + 6 SO2(8) M/g•mol-1 184 32.0 159 160 64.1 A¢H°(kJ/mol) -197 -80.0 -824 -297 1. What mass of SO2 gas, a source of acid rain, is produced from the reaction of 1234 g of CuFeS2? А. 431 g В. 372 g С. 645 g D. 287 g 2. What volume of O2 gas, measured at 15 °C and 1.00 atm, is required to react with 13.4 mol of CuFeS2? (R = 0.0821 L·atm/mol·K; T/K = T/°C+ 273.) A. 317 L В. 141 L C. 930 L D. 713 L 3. What is the value of the enthalpy change, AH°, for the above reaction? A. -1004 kJ B. +1004 kJ C. -2891 kJ D. -2802 kJ
The first step in the extraction of copper metal from its ore is shown below. The numbers beneath each formula are the molar mass, M, (units of grams/mole) and the enthalpy of formation, AfH°, (units of kilojoules/mole) of that substance. 4 CuFeS2(s) + 9 O2(8) → 2 Cu2s (s) + 2 Fe2O3(s) + 6 SO2(8) M/g•mol-1 184 32.0 159 160 64.1 A¢H°(kJ/mol) -197 -80.0 -824 -297 1. What mass of SO2 gas, a source of acid rain, is produced from the reaction of 1234 g of CuFeS2? А. 431 g В. 372 g С. 645 g D. 287 g 2. What volume of O2 gas, measured at 15 °C and 1.00 atm, is required to react with 13.4 mol of CuFeS2? (R = 0.0821 L·atm/mol·K; T/K = T/°C+ 273.) A. 317 L В. 141 L C. 930 L D. 713 L 3. What is the value of the enthalpy change, AH°, for the above reaction? A. -1004 kJ B. +1004 kJ C. -2891 kJ D. -2802 kJ
Chemistry: Principles and Reactions
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ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter8: Thermochemistry
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Problem 87QAP: The thermite reaction was once used to weld rails: 2Al(s)+Fe2O3(s)Al2O3(s)+2Fe(s)(a) Using heat of...
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
![The first step in the extraction of copper metal from its ore is shown below. The numbers beneath each
formula are the molar mass, M, (units of grams/mole) and the enthalpy of formation, AfH°, (units of
kilojoules/mole) of that substance.
4 CuFeS2(s) + 9 O2(8)
> 2 СuzS (s) +
2 Fe203(s)
+ 6 SO2(g)
M/g•mol-1
184
32.0
159
160
64.1
A¢H°(kJ/mol)
-197
-80.0
-824
-297
1. What mass of SO2 gas, a source of acid rain, is produced from the reaction of 1234 g of CuFeS2?
A. 431 g
В. 372 g
C. 645 g
D. 287 g
2. What volume of O2 gas, measured at 15 °C and 1.00 atm, is required to react with 13.4 mol of
CuFeS2? (R = 0.0821 L-atm/mol·K; T/K = T/°C + 273.)
А. 317 L
В. 141 L
С. 930 L
D. 713 L
3. What is the value of the enthalpy change, AH°, for the above reaction?
A. -1004 kJ
В. +1004 k]
С. -2891 kJ
D. -2802 kJ
4. Which of the following statements about AS°, the entropy change for the above reaction, is correct?
A. AS° >> 0
В. AS° ~ 0
C. AS° << 0
D. AS° cannot be estimated for this reaction.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1c9ec205-c724-4ca2-b5f2-e7d121be95e9%2Fc4d4427d-4921-4b12-84d9-f62045e71e32%2Ff8zhdi_processed.png&w=3840&q=75)
Transcribed Image Text:The first step in the extraction of copper metal from its ore is shown below. The numbers beneath each
formula are the molar mass, M, (units of grams/mole) and the enthalpy of formation, AfH°, (units of
kilojoules/mole) of that substance.
4 CuFeS2(s) + 9 O2(8)
> 2 СuzS (s) +
2 Fe203(s)
+ 6 SO2(g)
M/g•mol-1
184
32.0
159
160
64.1
A¢H°(kJ/mol)
-197
-80.0
-824
-297
1. What mass of SO2 gas, a source of acid rain, is produced from the reaction of 1234 g of CuFeS2?
A. 431 g
В. 372 g
C. 645 g
D. 287 g
2. What volume of O2 gas, measured at 15 °C and 1.00 atm, is required to react with 13.4 mol of
CuFeS2? (R = 0.0821 L-atm/mol·K; T/K = T/°C + 273.)
А. 317 L
В. 141 L
С. 930 L
D. 713 L
3. What is the value of the enthalpy change, AH°, for the above reaction?
A. -1004 kJ
В. +1004 k]
С. -2891 kJ
D. -2802 kJ
4. Which of the following statements about AS°, the entropy change for the above reaction, is correct?
A. AS° >> 0
В. AS° ~ 0
C. AS° << 0
D. AS° cannot be estimated for this reaction.
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