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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) ⇌ COCℓ₂(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, there is an increase in concentration of the product COCℓ₂, indicating that the reaction is proceeding towards products. The system's temperature increases due to the exothermic nature of the reaction (ΔH is negative). Hence, an increase in temperature is observed, and since volume expansion often occurs with gas reactions, a potential increase in volume can also be inferred.
Step 2
7 minutes
Answer
At 7 minutes, the concentration of COCℓ₂ reaches a plateau, suggesting that equilibrium is established. As the temperature stabilizes, it may decrease due to the system cooling after the exothermic reaction completes, suggesting a decrease in temperature. Therefore, the appropriate choice reflecting these changes would be an increase in temperature at 1 minute and a decrease in temperature at 7 minutes, leading us to select option A.