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What volume of hydrogen gas at and pre...

What volume of hydrogen gas at and pressure will be consumed in obtaining of elemental boron (atomic mass from the reduction of boron trichloride with hydrogen :

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`2BCl_(3) + 3H_(2) rarr 2B + 6HCl`
`10.8 xx 2 g "boron" = 3 xx 22.4 LH_(2)`
`:. 21.6 g "boron" = 3 xx 22.4 xx 21.6/2xx10.8 = 67.2 LH_(2)`
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