if LPG gas cylinder contains mixture of butane and iso butane , then the amount of oxygen tht would be required for combustion of 1 kg of it will be:
a)1.8 kg
b) 2.7 kg
c) 4.5 kg
d)3.58 kg

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Solution

Butane and isobutane have the same formula as both of them are isomers.
The combustion reaction is
$C_{4} H_{10} + \frac{13}{2} O_{2} \to 4 C O_{2} + 5 H_{2} O 58 g o f b u \tan e n e e d s \frac{13}{2} \times 32 g o f o x y g e n f o r i t s c o m b u s t i o n 1000 g o f b u \tan e n e e d s = \frac{\frac{13}{2} \times 32}{58} \times 1000 = 3.58 k g o f o x y g e n$

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