How many oxygen atoms are present in calcium bicarbonate, Ca(HCO3)2?

Calcium bicarbonate, represented by the formula Ca(HCO3)2, consists of one calcium ion (Ca²⁺) and two bicarbonate ions (HCO3⁻). Each bicarbonate ion contains a total of three oxygen atoms.

Since there are two bicarbonate ions in the formula, the total number of oxygen atoms can be calculated as follows:

1. Each HCO3 ion contributes three oxygen atoms.

2. With two HCO3 ions, you have: 3 oxygen atoms/ion × 2 ions = 6 oxygen atoms.

Thus, the total number of oxygen atoms present in calcium bicarbonate is six, confirming that C is the correct answer.