A student investigated the rate of decomposition of hydrogen peroxide solution in the presence of a manganese(IV) oxide catalyst. The volume of oxygen gas produced was measured over time. The results are shown in the table and plotted on the graph in Figure 1. A tangent has been drawn on the curve at 30 seconds.
| Time (seconds) | Volume of oxygen gas (cm³) |
|---|---|
| 0 | 0 |
| 10 | 28 |
| 20 | 48 |
| 30 | 62 |
| 40 | 71 |
| 50 | 77 |
| 60 | 80 |
| 70 | 80 |
| 80 | 80 |
| 90 | 80 |
Using the tangent in Figure 1, calculate the rate of reaction at 30 seconds.
rate of reaction=change in gas volumechange in time \text{rate of reaction} = \frac{\text{change in gas volume}}{\text{change in time}} rate of reaction=change in timechange in gas volumeGive your answer to 2 decimal places.
