A student investigated the rate of reaction between magnesium and dilute hydrochloric acid using different forms of the metal.
The table below shows the results of their experiment:
| Form of magnesium used | Volume of hydrogen gas produced in four minutes in cm3\text{cm}^3cm3 |
|---|---|
| Ribbon | 35 |
| Turnings | 75 |
| Powder | 120 |
Calculate the average rate of reaction for the magnesium powder in cm3 s−1\text{cm}^3 \text{ s}^{-1}cm3 s−1.
