C₂H₄O₂ is the molecular formula of acetic acid
Explanation:
Acetic acid have a molecular wight of 60 g/mol.
The correct mass percentages for acetic acid are 40% carbon, 6.67% hydrogen and 53.33 % oxygen.
To find the molecular formula knowing the elements mass percentages we use the following algorithm:
we divide each percentage by the atomic weight of the element
for carbon 40 / 12 = 3.33
for hydrogen 6.67 / 1 = 6.67
for oxygen 53.33 / 16 = 3.33
now we divide each value obtained by the smallest value, which is 3.33
for carbon 3.33 / 3.33 = 1
for hydrogen 6.67 / 3.33= 2
for oxygen 3.33 / 3.33 = 1
empirical formula for acetic acid is CH₂O
molecular formula for acetic acid is (CH₂O)ₓ
30x g/mol = 60 g/mol (given by the problem)
x = 2
so the molecular formula for acetic acid is C₂H₄O₂
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