How do you know if there is only 1 mol of CO3 for CaCO3?

Expert Answers
jerichorayel eNotes educator| Certified Educator

We can determine the number of moles of an ion based on their molecular formula. Let me show you some similar examples:

1 mole of NaCl has 1 mole of Na+ and 1 mole of Cl-

1 mole of Na2SO4 there are 2 moles of Na+ and 1 mole of SO4^2-


So if we try to relate this with your compound, we can see that there are 1 mole of CO3^2- and 1 mole of Ca2+.

in short, in 1 mole of CaCO3, there is 1 mole CO3^2-