An organic compound, Q, is made up of carbon, hydrogen and oxygen only. By mass, Q has $40.0\%$ carbon and $6.7\%$ hydrogen. What is the empirical formula of Q?
- A$\text{CHO}$
- B$\text{CH}_2\text{O}$
- C$\text{C}_2\text{HO}_2$
- D$\text{C}_3\text{H}_6\text{O}_3$