The empirical formula for the given compound is CH₂O. Therefore, option (5) is correct.
The empirical formula of a compound gives the simplest ratio of the number of different elements present in a compound. The molecular formula can be defined as a multiple of the empirical formula of a compound.
Given, the percent of carbon = 40 % = 40 g
The percent of hydrogen = 6.7 % = 6.7 g
The percent of oxygen = 53.3 % = 53.3 g
The moles of the carbon = 40/12 = 3.33
The moles of hydrogen = 6.7/1 = 6.7
The moles of oxygen = 53.3/16 = 3.33
The ratio of C: H:O can be written as 3.33: 6.7: 3.33
The simplest ratio can be 1 : 2 : 1
Therefore, the empirical formula of the given compound is CH₂O.
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