$C_{3} H_{8} \left ( g \right ) = 3 C \left ( s \right ) + 3 H_{2} \left ( g \right )$

$C_{3} H_{8} \left ( g \right ) = C_{3} H_{6} \left ( g \right ) + H_{2} \left ( g \right )$

$C_{3} H_{8} \left ( g \right ) + 5 O_{2} \left ( g \right ) = 3 C O \left ( g \right ) + 4 H_{2} O \left ( l \right )$