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Q.

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 borontrichloride by hydrogen

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a

22.4 L

b

67.2 L

c

89.6 L

d

44.8 L

answer is B.

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Detailed Solution

BCl3+3[H]→B+3HClBCl3+32H2→B+3HCl;B=21.610.8=2molB≡32H21mol≡32mol;2mol−3molV=3×22.4=67.2L
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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 borontrichloride by hydrogen