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Q.

What at volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

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a

44.8 L

b

22.4 L

c

67.2 L

d

89.6 L

answer is D.

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Detailed Solution

In the given reaction;

$\begin{array}{l} 2 {BCl}_{3} + 3 H_{2} \to 2 B + 6 HCl \\ [\frac{21.6}{10.8} = 2 mol] \\ V_{H_{2}} = 3 \times 22.4 L \end{array}$

$V_{H_{2}} = 67.2 L$

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