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

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

A

0.8 hours

B

3.2 hours

C

1.6 hours

D

6.4 hous

Text Solution

Verified by Experts

The correct Answer is:
B
`B_(2)H_(6)+3O_(2)toB_(2)O_(3)+3H_(2)O`
1 mol 3 mol
3 mol `O_(2)` is required for burning 1 mol `B_(2)H_(6)`
`H_(2)O overset("Electrolysis")toH_(2)+(1)/(2)O_(2)" (V.F. of "O_(2)=4)`
`("Equivalent of "O_(2))/("V.F. of "O_(2))=" mol of "O_(2)=3`
`[((100A)xxtsec)/(96500)]xx(1)/(4)=3`
`thereforet=(3xx96500)/(100xx3600)hr.=3.22hrs`.
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