* Identify the elements: The compound contains Calcium (Ca), Hydrogen (H), Carbon (C), and Oxygen (O).
* Count the atoms of each element:
* Calcium (Ca): 1 atom
* Hydrogen (H): 1 atom (within the HCO3 group) x 2 groups = 2 atoms
* Carbon (C): 1 atom (within the HCO3 group) x 2 groups = 2 atoms
* Oxygen (O): 3 atoms (within the HCO3 group) x 2 groups = 6 atoms
* Total atoms: 1 + 2 + 2 + 6 = 11 atoms
Therefore, there are 11 atoms present in one molecule of Ca(HCO3)2.
