Final answer:
The balanced chemical equation given has 6 oxygen atoms on each side, confirming that it is balanced in terms of the number of oxygen atoms.
Step-by-step explanation:
The question is asking about the number of oxygen atoms on each side of a balanced chemical equation. The correct equation mentioned should be: 2NaNO3 + CaCl2 → 2NaCl + Ca(NO3)2. To find the number of oxygen atoms, we look at the number of atoms in each compound. In 2 molecules of sodium nitrate (2NaNO3), there are 6 oxygen atoms (2 times 3), and in 1 molecule of calcium nitrate (Ca(NO3)2), there are also 6 oxygen atoms (2 times 3). Therefore, there are a total of 6 oxygen atoms on each side of the equation, confirming that the equation is balanced with respect to oxygen.