Balancing these equations?

Question

1) Na2CO3 + CO2 + Ca(NO3)2 -> ??
2) Na2CO3 + HCl + Ca(NO3)2 -> ??
3) Mg(NO3)2 + Na2CO3 + HCl -> ??

I can do equations like Na2CO3 + Ca(NO3)2 -> CaCO3 + 2NaNO3 but I cant do the ones like above. Any help and source to understanding is much appreciated!

Thank you!

I have another question. What would be NaHCO3 + Heat + HCL + Ca(NO3)2 --> ??

Answer 1

Na2CO3 + Ca(NO3)2 -> CaCO3 + 2NaNO3 (CO2 doesn't play a part)

Na2CO3 + 2HCl + Ca(NO3)2 -> CaCl2 + H2O + CO2 + 2NaNO3

Mg(NO3)2 + Na2CO3 + 2HCl -> MgCl2 + H2O + CO2 + 2NaNO3