Question

How long (approximate) should water be electrolysed by passing through $100$ amperes current so that the oxygen realised can completely burn $27.66g$ of diborane?

(Atomic weight of $B=10.8u$ )

• A. $0.8$ hours
• B. $3.2$ hours
• C. $1.6$ hours
• D. $6.4$ hours

Answer 1

The correct option is B $3.2$ hours

Reaction:

$B_2{H}_6+3O_2\to B_2{O}_3+3H_{2}O$

Moles of $O_2$ required = $3\times$ moles of $B_2{H}_6$

$\frac{I\times t}{96500}=$ moles of $O_2\times 4$

After solving , we get

t = 3.2 hours

Hence , option B is correct .