Calculate the percent composition of calcium in CaCO3 a. Step 1: b. Step 2: Solution: __

a. Step 1: Determine the molar mass of $CaCO3$.<br />- The molar mass of calcium (Ca) is 40.08 g/mol.<br />- The molar mass of carbon (C) is 12.01 g/mol.<br />- The molar mass of oxygen (O) is 16.00 g/mol.<br />- Therefore, the molar mass of $CaCO3$ is 40.08 + 12.01 + (3 * 16.00) = 100.09 g/mol.<br /><br />b. Step 2: Calculate the percent composition of calcium in $CaCO3$.<br />- The percent composition of calcium in $CaCO3$ is calculated by dividing the molar mass of calcium by the molar mass of $CaCO3$ and then multiplying by 100.<br />- Percent composition of calcium = (40.08 / 100.09) * 100 ≈ 40.00%<br /><br />Solution: The percent composition of calcium in $CaCO3$ is approximately 40.00%.