giúp e vơi ạ e cam ơn

Em tham khảo nha:

\(\begin{array}{l}
CTHH:{C_x}{H_y}{O_z}\\
{m_C} = 318 \times 75,47\%  = 240g \Rightarrow {n_C} = \dfrac{{240}}{{12}} = 20\,mol\\
 \Rightarrow x = 20\\
{m_H} = 4,35\%  \times 318 = 14g \Rightarrow y = 14\\
{m_O} = 20,18\%  \times 318 = 64g \Rightarrow {n_O} = \dfrac{{64}}{{16}} = 4\,mol\\
 \Rightarrow z = 4\\
CTHH:{C_{20}}{H_{14}}{O_4}
\end{array}\)