Consider the above sequence of reactions. 151 g of 2-bromopentane is made to react. Yield of major product P is 80% whereas Q is 100%. Mass of product Q obtained is ______ g. (Given molar mass in g : H : 1, C : 12, O : 16, Br : 80)??[2025]

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Solution

Q.

Consider the above sequence of reactions. 151 g of 2-bromopentane is made to react. Yield of major product P is 80% whereas Q is 100%.

Mass of product Q obtained is ______ g.

(Given molar mass in g ${mol}^{- 1}$ : H : 1, C : 12, O : 16, Br : 80) [2025]

Ans.
(184)

Moles of 2-bromopentane taken initially $= \frac{Mass of 2-bromopentane}{Molar mass of 2-bromopentane}$
$= \frac{151}{151} = 1 mol$

Molar mass of Q ( $C_{5} H_{10} {Br}_{2}$ )

$= (5 \times 12 + 10 \times 1 + 2 \times 80) {g mol}^{- 1} = 230 {g mol}^{- 1}$

Mass of 0.8 mol Q $= 0.8 \times 230 g = 184 g$

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