1. Tardigrade
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  3. Chemistry
  4. What 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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Q. What 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?

Some Basic Concepts of Chemistry

Solution:

$2BCl_3 + 3H_2 \to 6HCl + 2B$
or $BCl_3 + \frac{3}{2} H_2 \to 3HCl + B$
$10.8\, g$ boron requires hydrogen
$ = \frac{3}{2} \times 22.4\,L$
$21.6 \,g$ boron will require hydrogen
$ = \frac{3}{2} \times \frac{22.4}{10.8} \times 21.6 = 67.2\,L$