Question

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

(Atomic weight of $B=10.8u$)

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

Answer 1

Answer: (A)

3.2 hours

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

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

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

$t=3.2hrs$

So, the correct option is $A$