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?

Option 1)

89.6 L

Option 2)

67.2 L

Option 3)

44.8 L

Option 4)

22.4 L.

Answers (2)

As we learnt in

Number of Moles of a gas at STP -

no of moles of a gas at STP= given volume of gas / 22.4 liter

-

 

 BCl_{3}+\frac{3}{2}H_{2}\rightarrow B+3HCl

                                   \frac{21.6}{10.8}=2

\therefore\ \;    1 Mole B requires \frac{3}{2} Mole H2

\because    2 Mole B requires 2\times\frac{3}{2}=3 Moles\ of\ H_{2}

Volume of H2 at STP = 22.4\times 3=67.2L

Ans.Optin (2)

 


Option 1)

89.6 L

This is an incorrect option.

Option 2)

67.2 L

This is an incorrect option.

Option 3)

44.8 L

This is an incorrect option.

Option 4)

22.4 L.

This is an incorrect option.

N neha

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