SO2 (g) + CaCO3(s) → CaSO4 (s) + CO2 (g)
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Something is wrong. This is an impossible equation to balance.
S appears on both sides of the equation a single time. Therefore, the molar ratio between SO2 and CaSO4 is 1:1.
Ca appears on both sides once, too. Therefore, the molar ratio between CaCO3 and CaSO4 also has to be 1:1.
Lastly, Carbon appears on both sides a single time. This means that the molar ratio between CaCO3 and CO2 has to be 1:1.
It is physically impossible to satisfy this equation.
EDIT: Yeah, if you can add oxygen there then that would make everything work.
S appears on both sides of the equation a single time. Therefore, the molar ratio between SO2 and CaSO4 is 1:1.
Ca appears on both sides once, too. Therefore, the molar ratio between CaCO3 and CaSO4 also has to be 1:1.
Lastly, Carbon appears on both sides a single time. This means that the molar ratio between CaCO3 and CO2 has to be 1:1.
It is physically impossible to satisfy this equation.
EDIT: Yeah, if you can add oxygen there then that would make everything work.