The stoichiometric reaction of 516 g of dimethyldichlorosilane with water results in a tetrameric cyclic product X in 75% yield. The weight (in g) of X obtained is _____.
[Use, molar mass (): H = 1, C = 12, O = 16, Si = 28, Cl = 35.5]
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Answer and worked solution
Official answer: 222
Moles of silane. has , so 516 g is 4 mol.
Product. Hydrolysis gives , which condenses to the cyclic tetramer :
- molar mass ;
- 4 mol of monomer gives 1 mol of tetramer.
Yield. g.