The polyatomic carbonate ion (CO32−) is present in both the products and the reactants of the chemical equation shown below. Na2CO3 + SrCl2 → SrCO3 + 2NaCl

Which statement best describes the mass of carbonate (CO32−) in the products and the reactants of the equation?
A.
The mass in the products is two times as great as the mass in the reactants.
B.
The mass in the reactants is two times as great as the mass in the products.
C.
The mass in the products is equal to the mass in the reactants.
D.
The mass in the reactants is less than the mass in the products.