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GK QUESTION#3410

What is the ratio by mass of carbon and oxygen in carbon dioxide?

  1. A3: 8Correct answer
  2. B3: 13
  3. C3: 1
  4. D3: 2
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Answer

A. 3: 8

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Explanation

One CO₂ formula unit contains one carbon atom and two oxygen atoms. Using the rounded atomic masses C=12 and O=16 gives carbon: oxygen =12: (2×16)=12: 32=3: 8 by mass. This differs from the 1: 2 ratio of the numbers of atoms.

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