Boron and Carbon FamilyHard
Question
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 reducti on of boron trichloride by hydrogen?
Options
A.67.2 L
B.44.8 L
C.22.4 L
D.89.6 L
Solution
No. of moles of boron = 
= 2
for BCl3
∴ 1 mole of Boron = 3 mole of Cl
∴ 2 mole of Boron = 6 mole of Cl
H2 + Cl2 → 2HC
⇒ 3 moles of Hydrogen is required
= 3 × 22.4 = 67.2 Litre
= 2for BCl3
∴ 1 mole of Boron = 3 mole of Cl
∴ 2 mole of Boron = 6 mole of Cl
H2 + Cl2 → 2HC
⇒ 3 moles of Hydrogen is required
= 3 × 22.4 = 67.2 Litre
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