CH-1946

Empirical and molecular formulae

Chemistry · Secondary 4 · Hard · Empirical and molecular formulae

A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass.
(Relative atomic masses: C = 12, H = 1, O = 16.)

What is the empirical formula of the compound?

$CH_2O$
$C_2H_4O$
$C_3H_6O_3$
$C_2H_2O$

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