Given :: mass of Carbon = 24 g , mass of carbon dioxide =88g
Find : mass of oxygen
Solution ::
\(\begin{matrix}
C & +\space O_2 & \rightarrow CO_2\\
24g & ? & 88g
\end{matrix}\)
\(\therefore\) mass of oxygen = mass of carbon dioxide - mass of carbon
=88-24 = 64 g
mass of oxygen used in this equation is 64 g