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The following equation represents the reaction between chlorine gas, Cl₂, and carbon monoxide gas, CO - VCE - SSCE Chemistry - Question 17 - 2020 - Paper 1
Question 17
The following equation represents the reaction between chlorine gas, Cl₂, and carbon monoxide gas, CO. Cl₂(g) + CO(g) ⇌ COC l₂(g) ΔH = -108 kJ mol⁻¹ The concentrat... show full transcript
Worked Solution & Example Answer:The following equation represents the reaction between chlorine gas, Cl₂, and carbon monoxide gas, CO - VCE - SSCE Chemistry - Question 17 - 2020 - Paper 1
Step 1
1 minute
Answer
At 1 minute, the concentration graph indicates that the concentration of Cl₂ is decreasing while the concentration of CO is also decreasing, leading to the formation of COC l₂. Since this reaction is exothermic (as indicated by the negative ΔH), the increase in products reduces the temperature of the system according to Le Chatelier's principle. Therefore, there is a decrease in temperature.
Step 2
7 minutes
Answer
At 7 minutes, the concentrations are stabilizing, suggesting equilibrium has been reached. The reaction has produced more product (COC l₂), and since the reaction is exothermic, cooling the system would favor the production of reactants. Thus, the system is still experiencing a decrease in temperature.