The stoichiometric reaction of 516   g of dimethyldichlorosilane with water results in a tetrameric…

The dimethyldichlorosilane is ${\left({\mathrm{CH}}_3\right)}_2{\mathrm{SiCl}}_2$. The molecular mass is $129 \mathrm{u}$.

Number of moles of dimethyldichlorosilane initially taken $=\frac{516}{129}= 4\mathrm{moles}$

Applying POAC on Si atom

Moles of tetrameric cyclic product formed $=\frac{4}{4}\times \frac{75}{100}=0.75 \mathrm{moles}$

Molar mass of product formed $=296 \mathrm{g}/\mathrm{moles}$

The mass of product formed $=296\times 0.75=222 \mathrm{g}$