Question

What is the volume of water produced when 20grams of C7H16 (heptane) is combusted with oxygen.

(C7H16 + O2 = CO2 + H2O)

Answer 1

The equation for the reaction is;

$C_7H_{16}+O_2\to CO_2+H_2O$

Molar mass of $O_2=16g/mol$

Molar mass of $C_7H_{16}=100$ $g/mol$

From the reaction;

$(20g C_7H_{16})\times($ $1mol C_7H_{16}\over100g$ $)$ $\times$ $($ $1mol O_2\over1mol C_7H_{16}$ $)$ $\times$ $($ $22.4L\over 1mol O_2$ $)$

$=$ $448\over100$ $=4.48L$