WAEC Chemistry 2019 Theory — Question 9
Question 9 of 28 from the West African Examinations Council (WAEC) Chemistry 2019 Theory paper, with the correct answer and a full explanation.
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1(i) What is meant by carbon-12 scale? [2 marks]
Model answer
The carbon-12 scale is the scale on which the relative atomic masses of different atoms are expressed. On this scale, the relative atomic mass of an element is defined as the number of times one atom of the element is heavier than one-twelfth (1/12) the mass of one atom of carbon-12.
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