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**Reaction Times (in s) and Identification of Comparison Pairs**

*Record times one place past the decimal.*

| Group | A1 | A2 | A3 | A4 | A5 | A6 | A7 |
|-------|------|------|------|------|------|------|------|
| 1 | 99.8 | 54.1 | 34.1 | 45.9 | 35.4 | 25.3 | 10.5 |
| 2 | 94.9 | 48.7 | 33.7 | 50.5 | 35.5 | 23.5 | 10.4 |
| 3 | 98.5 | 54.4 | 33.5 | 46.0 | 31.9 | 24.2 | 10.6 |
| 4 | 91.2 | 53.1 | 33.4 | 49.1 | 35.2 | 23.5 | 11.5 |

**Identify reaction rates to compare for the determination of each exponent.**

*Numerator (Expt. Label) / Denominator (Expt. Label)*

- **First comparison pair for exponent a:**
- Numerator: A2
- Denominator: A1

- **Second comparison pair for exponent a:**
- Numerator: A3
- Denominator: A1

- **Third comparison pair for exponent a:**
- Numerator: A3
- Denominator: A2

- **First comparison pair for exponent b:**
- Numerator: A4
- Denominator: A1

- **Second comparison pair for exponent b:**
- Numerator: A5
- Denominator: A1

- **Third comparison pair for exponent b:**
- Numerator: A5
- Denominator: A4

- **First comparison pair for exponent c:**
- Numerator: A6
- Denominator: A1

- **Second comparison pair for exponent c:**
- Numerator: A7
- Denominator: A1

- **Third comparison pair for exponent c:**
- Numerator: A7
- Denominator: A6

Answer :

The reaction rates to compare for the determination of each exponent are as follows:

Exponent a:

First comparison pair: A2 / A1

Second comparison pair: A3 / A1

Third comparison pair: A3 / A2

The reaction rates

Exponent b:

First comparison pair: A4 / A1

Second comparison pair: A5 / A1

Third comparison pair: A5 / A4

Exponent c:

First comparison pair: A6 / A1

Second comparison pair: A7 / A1

Third comparison pair: A7 / A6

The exponents a, b, and c represent the orders of the reaction with respect to the reactants S2O32-, I-, and Br2, respectively. The reaction rates are determined by dividing the reaction times for two experiments with different concentrations of the same reactant.

For example, the first comparison pair for exponent a is A2 / A1. This means that we are dividing the reaction time for experiment A2 (where the concentration of S2O32- is 54.1 M) by the reaction time for experiment A1 (where the concentration of S2O32- is 99.8 M). The smaller the reaction time, the faster the reaction. Therefore, a smaller value of the reaction rate indicates a higher order of reaction.

Read more about reaction rates here:

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