Final answer:
The mass ratio of oxygen to carbon in carbon dioxide is 2.666.
Step-by-step explanation:
In carbon monoxide, the mass ratio of oxygen to carbon is 1.332. In carbon dioxide, the mass ratio of oxygen to carbon is 2.666. We can determine this by comparing the molar masses of the compounds and calculating the ratio. For example, carbon monoxide (CO) has a molar mass of 28 g/mol (12 g/mol for carbon and 16 g/mol for oxygen), while carbon dioxide (CO2) has a molar mass of 44 g/mol (12 g/mol for carbon and 32 g/mol for oxygen). By comparing the mass ratio, we can see that the ratio of oxygen in carbon dioxide is double that of carbon monoxide.