Final answer:
The weight % of oxygen in crude oil is generally less than 1%.
Step-by-step explanation:
The weight % of oxygen in crude oil varies depending on the source, but it is generally less than 1%. Crude oil is primarily made up of carbon and hydrogen compounds, with only small amounts of oxygen present. The oxygen content in crude oil is typically around 0.1% - 0.6%, but can be even lower in some cases.