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How long (approximate) should water be e...

How long (approximate) should water be electrolysed by passing through 100 ampere current so that oxygen released can completely burn 27.66 g diborane ?
(Atomic weight of B = 10.8 u)

A

0.8 hours

B

3.2 hours

C

1.6 hours

D

6.4 hours

Text Solution

Verified by Experts

The correct Answer is:
B
Diborane undergoes combustion as :
`B_(2)H_(6)+3O_(2) rarr B_(2)O_(3)+3H_(2)O`
Number of moles of oxygen `=3 xx` Number of moles of `B_(2)H_(6)`
`=3xx27.6/27.6=3`
Mass of oxygen required `=3xx32 g`
Faraday's first law :
`w=(It E)/(96500)`
`3xx32=(100xxtxx8)/(96500)`
`t=11580 sec = 3.2 hr`
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