Question

what is the percent composition of calcium in calcium chloride (cacl₂)? round your answer to the nearest whole percent. use the periodic table to help you find the necessary molar masses. type the correct answer in the box. the percent composition of calcium is %.

Explanation:

Step1: Find molar mass of CaCl₂

Molar mass of Ca: \(40.08\) g/mol, Cl: \(35.45\) g/mol.
For \(CaCl_2\), molar mass \(= 40.08 + 2\times35.45 = 40.08 + 70.9 = 110.98\) g/mol.

Step2: Calculate percent composition of Ca

Percent composition \(= \frac{\text{Molar mass of Ca}}{\text{Molar mass of }CaCl_2} \times 100\%\)
\(= \frac{40.08}{110.98} \times 100\% \approx 36.11\%\), rounded to nearest whole percent is \(36\%\).

Answer:

36