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An alkane has a C/H-ratio (by mass) of 5...

An alkane has a C/H-ratio (by mass) of 5.1428. Its molecular formula is

A

`C_(5)H_(12)`

B

`C_(6)H_(14)`

C

`C_(8)H_(18)`

D

`C_(7)H_(10)`

Text Solution

Verified by Experts

The correct Answer is:
B
The ratio of C/H in an alkane is 5.1428. Alkanes have General formula- `C_(n)H_(2n+2)`
The mass ratio of `C/H` is `(12 n)/(2n + 2)` or `(6n)/(n+1)`
`(6n)/(n+1) = 5.1428`
`6n = 5.1428n + 5.1428 = 0.8572n + 5.1428`
`n = 5.1428/0.8572 = 6`
molecular formula `= C_(6)H_(2n+2) = C_(6)H_(14)`
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