Question

A gaseous alkane is exploded with oxygen. The volume of O2 for complete combustion to CO2 formed is in the ratio 7/4. The molecular formula of alkane is :

• A. C2H4
• B. C2H6
• C. CH4
• D. C4H12

Answer 1

Answer: (B)

C2H6

Answer 2

(2)

$C_{x}H_{y}\text{ + }\left( x + \frac{y}{4} \right)O_{2}\overset{\quad\quad}{\rightarrow}\text{xC}\text{O}_{2}\text{+ }\text{H}_{2}\text{O }$

$\frac{x + \frac{y}{4}}{x} = \frac{7}{4}$

$\frac{y}{4x} = \frac{3}{4}$

$\frac{3}{4} = \frac{3}{1}$