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tutor determining percent composition
calculate the mass percent of cl in sicl2i2.
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Explanation:

Step1: Find molar masses

The molar mass of Si is $M_{Si}=28.09\ g/mol$, and the molar mass of Cl is $M_{Cl} = 35.45\ g/mol$. For $SiCl_{2}I_{2}$, the molar mass of the compound $M$ is calculated as follows:
\[M = M_{Si}+2M_{Cl}+2M_{I}\]
\[M=28.09 + 2\times35.45+2\times126.90\]
\[M=28.09+70.90 + 253.80\]
\[M = 352.79\ g/mol\]

Step2: Calculate mass - percent of Cl

The total mass of Cl in the compound is $m_{Cl}=2\times35.45 = 70.90\ g/mol$.
The mass - percent of Cl is given by the formula \(\text{Mass}\%=\frac{m_{Cl}}{M}\times100\%\)
\[ \text{Mass}\%=\frac{70.90}{352.79}\times 100\%\]
\[ \text{Mass}\% \approx 20.1\%\]

Answer:

20.1%