Question

The number of water molecules formed by the combustion of one mole of alkane containing $m$ carbon atoms is:

• A. $m$
• B. $\frac{m}{2}$
• C. $m+1$
• D. $m-1$

Answer 1

Answer: (C)

$m+1$

The general formula of alkane is $C_m{H}_{2m}$. The combustion reaction is as follows:
$C_m{H}_{(2m+2)}+\frac{3m+1}{2}{O}_2\to mC{O}_2+(m+1)H_{2}O$
$(m+1)$ water molecules are formed in the combustion of one mole of alkane containing $m$ carbon atoms.