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Date Posted: 08:33:40 08/04/01 Sat
Author: Eugenia
Subject: qns from other chem bks

Hi Mr. Yeo,
There is a mcq qns from my assesment book which i want to verify. -
What is the empirical formula of ethanoic acid?
A: CH20
B: CH4O
C: C2H4O
D: C2H6O
The ans states that it is A. can u pls explain? thanx

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Replies:

[> Re: qns from other chem bks -- Mr. Yeo Woei Ter, 19:21:30 08/04/01 Sat

Hi Eugenia!

The formula of ethanoic acid is CH3COOH or can be written as C2H4O2.

The ratio of C:H:O = 2:4:2

The simplest ratio = 1:2:1

Thus the empirical formula is CH2O!

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