Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Transcribed Image Text:A chemical engineer is studying the two reactions shown in the table below.
In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant temperature of 67.0 °C and constant total pressure. Then,
he measures the reaction enthalpy AH and reaction entropy AS of the first reaction, and the reaction enthalpy AH and reaction free energy AG of the second
reaction. The results of his measurements are shown in the table.
Complete the table. That is, calculate AG for the first reaction and AS for the second. (Round your answer to zero decimal places.) Then, decide whether, under
the conditions the engineer has set up, the reaction is spontaneous, the reverse reaction is spontaneous, or neither forward nor reverse reaction is spontaneous
because the system is at equilibrium.
2NH₂(g) → N₂H₂(g) + H₂(g)
4FeC1₂ (s) + 30₂ (g)
6C₁₂(g) + 2Fe₂O₂ (s)
AH = 188. kJ
AS = 553.
AG =
J
K
Which is spontaneous?
O this reaction
O the reverse reaction
Oneither
AH = -50. kJ
AS =
02
AG = 11. kJ
Which is spontaneous?
Othis reaction
O the reverse reaction
O neither
00
Expert Solution
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Step 1
If for a reaction
∆G= -ve => forward rxn is spontaneous
∆G= +ve => reverse rxn is spontaneous
∆G= 0 => rxn is in equilibrium.
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