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How many moles of oxygen gas are needed ...

How many moles of oxygen gas are needed to perform the combustion of one mole of alkane, `C_(n)H_(2n+1)`?

A

`3n`

B

`3n+1`

C

`n+1`

D

`((3n+1))/(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
The number of moles of `CO_(2)` is always equal to the number of moles of `C` because one `C` gives one `CO_(2)`. The number of moles of `H_(2)O` is half of the number of moles of `H` because on `H` gives `1//2H_(2)O`.
`nCrarrnCO_(2), i.e.,nO_(2)`
`2(n+1)Hrarr(n+1)H_(2)O, i.e, (n+1)/(2)O_(2)`
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