Q7. Hydrogen can be manufactured from the reaction of steam with methane. CH:(g) + H2O(g) CO(g) + 3H2(g) (a) The table contains some enthalpy of formation and entropy data. Substance AH.I kJ mol- S* IJK- mol- CH:(g) -75 186 H:O(g) -242 189 Co(g) -111 198 H:(g) 131 CO:(g) -394 214 (i) Use data from the table to calculate the enthalpy change, AH, for the reaction of steam with methane. Page 10 of 12 (ii) Use data from the table to calculate the entropy change, AS, for the reaction of steam with methane. (b) Use your values of AH and AS from parts (a)(i) and (a)(ii) to calculate the temperature above which this reaction is feasible. (c) The temperature used for this manufacture of hydrogen is usually about 1300 K. Suggest one reason, other than changing the position of equilibrium, why this temperature is used rather than the value that you calculated in part (b).

Q7. Hydrogen can be manufactured from the reaction of steam with methane. CH:(g) + H2O(g) CO(g) + 3H2(g) (a) The table contains some enthalpy of formation and entropy data. Substance AH.I kJ mol- S* IJK- mol- CH:(g) -75 186 H:O(g) -242 189 Co(g) -111 198 H:(g) 131 CO:(g) -394 214 (i) Use data from the table to calculate the enthalpy change, AH, for the reaction of steam with methane. Page 10 of 12 (ii) Use data from the table to calculate the entropy change, AS, for the reaction of steam with methane. (b) Use your values of AH and AS from parts (a)(i) and (a)(ii) to calculate the temperature above which this reaction is feasible. (c) The temperature used for this manufacture of hydrogen is usually about 1300 K. Suggest one reason, other than changing the position of equilibrium, why this temperature is used rather than the value that you calculated in part (b).

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Q7.
Hydrogen can be manufactured from the reaction of steam with methane.
CH:(g) + H2O(g)
CO(g) + 3H2(g)
(a)
The table contains some enthalpy of formation and entropy data.
Substance
AH. / kJ mol-
S* IJK- mol-
CH:(g)
-75
186
H:O(g)
-242
189
Co(g)
-111
198
H:(g)
131
CO:(g)
-394
214
(i)
Use data from the table to calculate the enthalpy change, AH, for the reaction
of steam with methane.
Page 10 of 12
(ii)
Use data from the table to calculate the entropy change, AS, for the reaction of
steam with methane.
(b)
Use your values of AH and AS from parts (a)(i) and (a)(ii) to calculate the
temperature above which this reaction is feasible.
(c)
The temperature used for this manufacture of hydrogen is usually about 1300 K.
Suggest one reason, other than changing the position of equilibrium, why this
temperature is used rather than the value that you calculated in part (b).

(d)
Hydrogen can also be obtained by reaction of carbon monoxide with steam.
CO(g) + H2O(g)
CO2(g) + H2(g) AH = -41 kJ mol-1, AS = -42 J K-1 mol-1
(i)
Explain, using a calculation, why this reaction should not occur at 1300 K.
Page 11 of 12
(ii)
Explain how the conditions for the reaction could be changed to allow this
reaction to take place.

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