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 ?

Options

A. 22.4L
B. 89.6L
C. 67.2 L
D. 44.8L

Answer

C

Explanation

`BCl_(3) + 3[H] to B + 3HCI`
`BCl_(3) + (3)/(2) H_(2) to B + 3HCl , B = (21.6)/(10.8) = 2` mole
`B = (3)/(2)H_(2)`
1 mole `= (3)/(2)` mole , ,2 mole = 3 mole
`V = 3 xx 22.4 = 67.2L`