Water boiled contained 16. 2g of calcium hydrogen carbonate.Calculate the mass of CaCO3 formed?

To calculate the mass of CaCO3 formed from the given information, you need to understand the chemical reaction taking place.

The formula for calcium hydrogen carbonate is Ca(HCO3)2, and when it is heated, it decomposes into calcium carbonate (CaCO3), water (H2O), and carbon dioxide (CO2).

The molar mass of Ca(HCO3)2 is 162.11 g/mol, while the molar mass of CaCO3 is 100.09 g/mol.

Now, let's calculate the number of moles of Ca(HCO3)2:
Number of moles = Mass / Molar mass
Number of moles = 16.2 g / 162.11 g/mol = 0.1 mol (approximately)

From the balanced chemical equation, we know that the ratio of Ca(HCO3)2 to CaCO3 is 1:1. Therefore, the number of moles of CaCO3 formed is also 0.1 mol.

Finally, calculate the mass of CaCO3:
Mass of CaCO3 = Number of moles × Molar mass
Mass of CaCO3 = 0.1 mol × 100.09 g/mol = 10.009 g (approximately)

Therefore, the mass of CaCO3 formed is approximately 10.009 grams.