A gaseous alkane is burnt completely in oxygen- The volume of O-2required for complete combustion to the volume of nbsp-CO-2 nbsp-formed is 7-4- Determine the formula for alkane- -Alkane is C-n H-2n - 2-

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Standard XII

Chemistry

Laws of Mass Conservation

A gaseous alk...

Question

A gaseous alkane is burnt completely in oxygen. The volume of $O_{2}$ required for complete combustion to the volume of $C O_{2}$ formed is 7:4. Determine the formula for alkane. [Alkane is $C_{n} H_{2 n + 2}$ ]

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Solution

The correct option is A

In organic chemistry, you have learnt that general formula of an alkane is $C_{n} H_{2 n + 2}$ .
When an alkane is burnt completely burnt in $O_{2}$ ,

$C_{n} H_{2 n + 2} + [n + \frac{n + 1}{2}] O_{2} \to n C O_{2} + (n + 1) H_{2} O (1)$

Given that $\frac{v o l o f O_{2} r e q u i r e d}{v o l o f C O_{2} f o r m e d}$ = $\frac{7}{4}$

$\frac{n + (\frac{n + 2}{2})}{n}$ = $\frac{7}{4}$

n = 2

$∴$ The alkane is $C_{2} H_{6}$

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A gaseous alkane is burnt completely in oxygen. The volume of O2required for complete combustion to the volume of CO2 formed is 7:4. Determine the formula for alkane. [Alkane is CnH2n+2]

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