Mole ConceptMedium
Question
A gaseous alkane is exploded with oxygen. The volume of O2 for complete combustion to the volume of CO2 formed is in 7:4 ratio. The molecular formula of alkane is
Options
A.CH4
B.C3H 8
C.C2H 6
D.C4H10
Solution
$C_{n}H_{2n + 2} + \left( \frac{3n + 1}{2} \right)O_{2} \rightarrow nCO_{2} + (n + 1)H_{2}O$
From question, $\left( \frac{3n + 1}{2} \right):n = 7:4$
$\Rightarrow n = 2 \Rightarrow \text{Alkane = }\text{C}_{2}H_{6}$
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