The reaction kinetics for the reaction between the gases C 2 (g) and AB(g) was i...
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The reaction kinetics for the reaction between the gases C2(g) and AB(g) was investigated and the data is presented in the table below:
2C2(g) + 2AB(g) → A2(g) + 2C2B(g)
| Experiment | Initial [C2]/ mol L–1 | Initial [AB]/ mol L–1 | Initial rate/ mol L–1 s–1 |
| 1 | 0.100 | 0.025 | 2.87 × 10–4 |
| 2 | 0.100 | 0.050 | 1.15 × 10–3 |
| 3 | 0.300 | 0.025 | 8.61 × 10–4 |
| 4 | 0.200 | 0.075 | 5.16 × 10–3 |
- Complete the rate equation with appropriate values for the rate constant and orders. Only enter numeric values in each box, do not enter units. [3 marks]
rate = × [C2][AB]
- Below are three reaction mechanisms that have been proposed for the reaction between C2(g) and AB(g). Which mechanism is consistent with the rate law for this reaction? [3 marks]
| Mechanism 1:Step 1:Overall: | 2C2(g) + 2AB(g) → A2(g) + 2C2B(g)2C2(g) + 2AB(g) → A2(g) + 2C2B(g) | slow |
| Mechanism 2:Step 1:Step 2:Overall: | C2(g) + 2AB(g) → A2B(g) + C2B(g)A2B(g) + C2(g) → A2(g) + C2B(g)2C2(g) + 2AB(g) → A2(g) + 2C2B(g) | slowfast |
| Mechanism 3:Step 1:Step 2:Overall: | 2AB(g) → A2(g) + B2(g)B2(g) + 2C2(g) → 2C2B(g)2C2(g) + 2AB(g) → A2(g) + 2C2B(g) | slowfast |
- In mechanism 2 above, what is the molecularity of step 1? [1 mark]
- In mechanism 3 above, which step is the rate determining step? [1 mark]
- In mechanism 3 above, which species is an intermediate? [1 mark]
- In general, if the first step in a mechanism is fast, and the second step is slow, what is the usual approximation made about the first step? [1 mark]
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