Question

Asked in: JEE Main-2003

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?

A.

89.6 L

B.

67.2 L

C.

44.8 L

D.

22.4 L.

Answers (1)

BCl_3 + 3H \rightarrow B + 3HCl

BCl_3 + \frac{3}{2}H \rightarrow B + 3HCl

Moles of boron ,B = \frac{21.6}{10.8} = 2\ moles

Therefore, moles of H_2 consumed = \frac{3}{2}\times2= 3\ moles

Therefore, volume of H_2 at NTP = (22.4\times3)\ L = 67.2\ L

Answer: B. 

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