Limestone is used to reduce sulfur dioxide emissions from coal-fired power stations.
The equation for the reaction is shown.
CaCO$_3$ + SO$_2$ $\rightarrow$ CaSO$_3$ + CO$_2$
What is the smallest mass of CaCO$_3$ required to remove 1 tonne of CO$_2$?
1 )
1 tonne
2 tonnes
3 )
64 tonnes
4 )
100 tonnes
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