The stoichiometric reaction of 516 g of dimethyldichlorosilane with water results in a tetrameric cyclic product in 75% yield. The weight (in g) of obtained is___.
[Use, molar mass $(g {mol}^{- 1})$ : H = 1, C = 12, O = 16, Si = 28, Cl = 35.5]

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answer is 222.

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Detailed Solution

${({CH}_{3})}_{2} {SiCl}_{2}$ M.wt=129
To get tetramer, 4 moles must be taken
The M.wt. of tetrameric cyclic product x is 296
If 100 % yield is there then 296
For 75% yield we get $296 \times \frac{75}{100} = 222$

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