When silicon react with $C H_{3} C l,$ different products such as $C H_{3} S i C l_{3}, {(C H_{3})}_{2} S i C l_{2}, {(C H_{3})}_{3} S i C l$ may be formed. Assuming that only ${(C H_{3})}_{2} S i C l_{2}$ is formed, what are the weights with chain silicones, if we start with 84% pure 200 g of silicon. (assume that the terminal silicon atoms in straight chain silicone are in bond with OH groups)
(At wts Si = 28, C = 12, Cl = 35., H = 1, O = 16)

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answer is 462.

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Detailed Solution

$100 g m$ of impure $S i$ contain $84 g$ of $S i 200 g m$ contain
$\frac{200 \times 84}{100} = 168 g .$
Number of moles of $S i = \frac{168}{28} = 6$
One mole of silicon can give one mole of ${(C H_{3})}_{2} S i C l_{2}$
6 moles of gives 6 moles of ${(C H_{3})}_{2} S i C l_{2}$
Condensation of 6 moles ${(C H_{3})}_{2} S i C l_{2}$ after hydrolysis may give a straight chain silicone or a cyclic silicone

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$432 g m$