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The relationships between ΔH and TΔS with temperature for a chemical system are displayed in the graph - HSC - SSCE Chemistry - Question 33 - 2021 - Paper 1
Question 33
The relationships between ΔH and TΔS with temperature for a chemical system are displayed in the graph. (a) Calculate ΔG for this system at 300 K. (b) What can be ... show full transcript
Worked Solution & Example Answer:The relationships between ΔH and TΔS with temperature for a chemical system are displayed in the graph - HSC - SSCE Chemistry - Question 33 - 2021 - Paper 1
Step 1
What can be deduced about the system when the temperature is T₁, T₂, and T₃?
Answer
The deductions from the graph can be summarized as:
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At Temperature T₁: The values of ΔG and TΔS suggest that the reaction is spontaneous because ΔG is negative. This indicates that the system is moving towards equilibrium.
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At Temperature T₂: Here, ΔG equals 0, which means that the reaction is at equilibrium. There is no net change in the concentrations of the reactants and products.
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At Temperature T₃: The value of ΔG is positive, indicating that the reaction is non-spontaneous. The system moves away from equilibrium under these conditions.
These deductions are supported by the changing values of ΔH and TΔS in relation to temperature as displayed in the graph.