A power station fits equipment that sprays calcium carbonate into its flue gases. The mass of sulfur dioxide leaving the chimney each hour was measured before and after the equipment was fitted.
| Sulfur dioxide leaving per hour / tonne | |
|---|---|
| Before | 8.0 |
| After | 0.6 |
Calculate the percentage of the sulfur dioxide that is removed by the equipment.
[2]
Name the calcium-containing salt formed when calcium carbonate reacts with sulfur dioxide.
[1]
State why it is important to remove sulfur dioxide from flue gases.
[1]