Distillation of crude oil from various parts of the world yields different percentages of hydrocarbons because the proportions of components in a mixture can vary.
Crude oil is a mixture of hydrocarbons formed underground under anaerobic conditions going on fro millions of years under conditions of high temperature and pressure.
In various parts of the world, the proportions of components of hydrocarbons in crude oil vary. Therefore, no two places in the world has crude oil containing the same percentage of hydrocarbons as such, crude oil from various parts of the world yields different percentages of hydrocarbons because the proportions of components in a mixture can vary.
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