Question

What mass if calcium carbonate is produced from 2.53 mol of sodium carbonate?

Na2CO3+Ca(NO3)2—> CaCO3+2NaNO3

Answer 1

The equation tells you that you get 1 mol CaCO3 from 1 mol Na2CO3 which means you get 2.53 mols CaCO3 from 2.53 mols Na2CO3.
Then grams CaCO3 = mols CaCO3 x molar mass CaCO3 = ?