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volume of hydrogen gas

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.

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