4. what is the % by mass of each element in caco₃?

Answer

Explanation:

Step1: Calculate molar mass of CaCO₃

The molar mass of Ca is 40.08 g/mol, C is 12.01 g/mol, and O is 16.00 g/mol. For CaCO₃, molar mass $M = 40.08+12.01 + 3\times16.00=40.08 + 12.01+48.00 = 100.09$ g/mol.

Step2: Calculate mass - percentage of Ca

Mass - percentage of Ca, $%Ca=\frac{40.08}{100.09}\times100%\approx40.04%$.

Step3: Calculate mass - percentage of C

Mass - percentage of C, $%C=\frac{12.01}{100.09}\times100%\approx12.00%$.

Step4: Calculate mass - percentage of O

Mass - percentage of O, $%O=\frac{48.00}{100.09}\times100%\approx47.96%$.

Answer:

The mass - percentage of Ca is approximately 40.04%, of C is approximately 12.00%, and of O is approximately 47.96%.