Some Basic Concepts Of Chemistry Question 282
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 reduction of boron trichloride by Hydrogen [AIEEE 2003]
Options:
A) 22.4 L
B) 89.6 L
C) 67.2 L
D) 44.8 L
Show Answer
Answer:
Correct Answer: C
Solution:
$ BCl _3+3[H]\to B+3HCl $
$ BCl _3+\frac{3}{2}H _2\to B+3HCl $ ; $ B=\frac{21.6}{10.8}=2 $ mole $ B\equiv \frac{3}{2}H _2 $
1mole $ \equiv \frac{3}{2} $ mole ; 2 mole ? 3 mole $ V=3\times 22.4=67.2L $ .
