# 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?

21.6 g of elemental boron = 2 moles

3H2 + 2BCl3 = 2B + 6HCl

3 moles of Hydrogen gas will be consumed in obtaining 21.6 g of elemental boron

$3\times 22.4=67.2$

67.2 litres of Hydrogen gas will be consumed in obtaining 21.6 g of elemental boron.

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