What percent of Ca by weight is present in \(CaCO_3\) ?
Show Hint
- \(\text{40}\)
- \(\text{48}\)
- \(\text{96}\)
- \(\text{12}\)
The Correct Option is A
Solution and Explanation
Understanding the Molar Mass and Percentage of Ca in CaCO₃
The molar mass of \( \text{CaCO}_3 \) is calculated as follows:
\[ \text{Molar mass of } \text{CaCO}_3 = 40 + 12 + (16 \times 3) = 100 \, \text{g/mol} \]
The percentage of Ca in \( \text{CaCO}_3 \) is given by:
\[ \frac{40}{100} \times 100 = 40\% \]
Selecting the correct option. Since the calcium content is 40%, the correct answer is (A) 40.
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