Initially, scientists defined the atomic mass unit (u) as 1/16 of the mass of an atom of naturally occurring oxygen.
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The modern unit of atomic mass, as per the latest IUPAC recommendations, is the unified mass, represented as ‘u’ (unified atomic mass unit).
The combining ratio between carbon and oxygen is expressed as 3 grams of carbon combining with 4 grams of oxygen to form carbon monoxide.
It was observed experimentally that 3 grams of carbon combines with 4 grams of oxygen to form carbon monoxide.
The molecular formula of carbon monoxide is CO.