Chemistry 5070 · O Level · Formulae

Formulae — practice question

By mass, compound $Q$ consists of $40.00\%$ carbon, $6.67\%$ hydrogen and $53.33\%$ oxygen. [$A_r$: $\text{C}$, $12$; $\text{H}$, $1$; $\text{O}$, $16$]
(main)[1]

State the empirical formula of $Q$.

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