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QUESTION
Q87) What volume of hydrogen gas, at 273K and 1 atm pressure will be consumed in obtaining 21.6g of elemental boron ( atomic mass=10.8) from the reduction of boron tri chloride by hydrogen? [ AIEEE 2003]




SOLUTION

2BCl3 + 3H2 → 2B + 6 HCl
Thus 3 moles of H2 gives 2 moles of B=21.6gAnswer: (a)