World of Chemistry
World of Chemistry
7th Edition
ISBN: 9780618562763
Author: Steven S. Zumdahl
Publisher: Houghton Mifflin College Div
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Chapter 10, Problem 35A
Interpretation Introduction

Interpretation:

Standard enthalpy change for the given reaction must be calculated in which FeO is reduced to Fe by CO.

Concept Introduction:

Hess’ law states that if a process is carried out separately in single and multiple steps then in both cases same amount of heat energy will be released or absorbed provided the initial and final states are same in both the cases.

Using this law standard enthalpy change for a given reaction can be calculated.

Expert Solution & Answer
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Answer to Problem 35A

Standard enthalpy change for the given reaction must be calculated in which FeO is reduced to Fe by CO is +1 kJ.

Explanation of Solution

  Fe3O4(s)+CO(g)3FeO(s)+CO2(g).....(1) ΔH°=-18kJ.3Fe2O3(s)+CO(g)2Fe3O4(s)+CO2(g).......(2) ΔH°=-39kJ.Fe2O3(s)+3CO(g)2Fe(s)+3CO2(g).....(3)    ΔH°=-23kJ.

Multiplying equation ‘1’ with 2 and reversing it, reversing equation ‘2’ and multiplying equation ‘3’ with 3

it can be written

  6FeO(s)+2CO2(g)2Fe3O4(s)+2CO(g).....(4)    ΔH°=+36kJ.2Fe3O4(s)+CO2(g)3Fe2O3(s)+CO(g).....(5)    ΔH°=+39kJ.3Fe2O3(s)+9CO(g)6Fe(s)+9CO2(g).....(6)    ΔH°=-69kJ.

Now adding equation ‘4’, ‘5’ and 6’ it can be written

  6FeO(s)+2CO2(g)2Fe3O4(s)+2CO(g).....(4)    ΔH°=+36kJ.2Fe3O4(s)+CO2(g)3Fe2O3(s)+CO(g).....(5)    ΔH°=+39kJ.3Fe2O3(s)+9CO(g)6Fe(s)+9CO2(g).....(6)    ΔH°=-69kJ.--------------------------------------------------------------------------------6FeO(s)+6CO(g)6Fe(s)+6CO2(g).......(7)    ΔH°=+6kJ.

Now dividing equation ‘7’ with 6 it can be written

  FeO(s)+CO(g)Fe(s)+CO2(g).......(7)    ΔH°=+1kJ

Conclusion

Standard enthalpy change for the given reaction is +1 kJ.

Chapter 10 Solutions

World of Chemistry

Ch. 10.2 - Prob. 4RQCh. 10.2 - Prob. 5RQCh. 10.2 - Prob. 6RQCh. 10.3 - Prob. 1RQCh. 10.3 - Prob. 2RQCh. 10.3 - Prob. 3RQCh. 10.3 - Prob. 4RQCh. 10.3 - Prob. 5RQCh. 10.4 - Prob. 1RQCh. 10.4 - Prob. 2RQCh. 10.4 - Prob. 3RQCh. 10.4 - Prob. 4RQCh. 10.4 - Prob. 5RQCh. 10.4 - Prob. 6RQCh. 10.4 - Prob. 7RQCh. 10 - Prob. 1ACh. 10 - Prob. 2ACh. 10 - Prob. 3ACh. 10 - Prob. 4ACh. 10 - Prob. 5ACh. 10 - Prob. 6ACh. 10 - Prob. 7ACh. 10 - Prob. 8ACh. 10 - Prob. 9ACh. 10 - Prob. 10ACh. 10 - Prob. 11ACh. 10 - Prob. 12ACh. 10 - Prob. 13ACh. 10 - Prob. 14ACh. 10 - Prob. 15ACh. 10 - Prob. 16ACh. 10 - Prob. 17ACh. 10 - Prob. 18ACh. 10 - Prob. 19ACh. 10 - Prob. 20ACh. 10 - Prob. 21ACh. 10 - Prob. 22ACh. 10 - Prob. 23ACh. 10 - Prob. 24ACh. 10 - Prob. 25ACh. 10 - Prob. 26ACh. 10 - Prob. 27ACh. 10 - Prob. 28ACh. 10 - Prob. 29ACh. 10 - Prob. 30ACh. 10 - Prob. 31ACh. 10 - Prob. 32ACh. 10 - Prob. 33ACh. 10 - Prob. 34ACh. 10 - Prob. 35ACh. 10 - Prob. 36ACh. 10 - Prob. 37ACh. 10 - Prob. 38ACh. 10 - Prob. 39ACh. 10 - Prob. 40ACh. 10 - Prob. 41ACh. 10 - Prob. 42ACh. 10 - Prob. 43ACh. 10 - Prob. 44ACh. 10 - Prob. 45ACh. 10 - Prob. 46ACh. 10 - Prob. 47ACh. 10 - Prob. 48ACh. 10 - Prob. 49ACh. 10 - Prob. 50ACh. 10 - Prob. 51ACh. 10 - Prob. 52ACh. 10 - Prob. 53ACh. 10 - Prob. 54ACh. 10 - Prob. 55ACh. 10 - Prob. 56ACh. 10 - Prob. 57ACh. 10 - Prob. 58ACh. 10 - Prob. 59ACh. 10 - Prob. 60ACh. 10 - Prob. 61ACh. 10 - Prob. 62ACh. 10 - Prob. 63ACh. 10 - Prob. 64ACh. 10 - Prob. 65ACh. 10 - Prob. 1STPCh. 10 - Prob. 2STPCh. 10 - Prob. 3STPCh. 10 - Prob. 4STPCh. 10 - Prob. 5STPCh. 10 - Prob. 6STPCh. 10 - Prob. 7STPCh. 10 - Prob. 8STPCh. 10 - Prob. 9STPCh. 10 - Prob. 10STPCh. 10 - Prob. 11STP
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