Answer :
What is the percent by mass of calcium in calcium carbonate, CaCO3? (Molar mass of CaCO3 = 100.09 g/mol)
Answer: 40.04 percent
The percent by mass is the mass of the solute by the mass of the compound. The percent by mass of calcium in calcium carbonate is 40.1 %.
What is mass percent?
The mass percentage is calculated as the ratio of the mass of the element divided by the mass of the compound and multiplied by 100.
We know,
Mass of calcium (element) = 40.078
Mass of calcium carbonate (compound) = 100.0869 g/mol
The mass percent is calculated as:
[tex]\begin{aligned} \text{mass percent} &= \dfrac{\text{mass of element}}{\text{mass of compound}} \times 100\%\\\\&= \dfrac{40.078}{100.087}\times 100\%\\\\&= 40.11\%\end{aligned}[/tex]
Therefore, the mass percent of calcium is 40.1%.
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