The combining ratio between carbon and oxygen is expressed as 3 grams of carbon combining with 4 grams of oxygen to form carbon monoxide.
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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.
Relative atomic masses were determined by analyzing the ratios in which elements combined to form compounds and applying the laws of chemical combinations to deduce the relative masses of the atoms involved.
Determining the mass of an individual atom was challenging, so scientists determined relative atomic masses using chemical combinations and the compounds formed, as per Dalton’s theory.