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Hydrocarbons are compounds that are composed of carbon and hydrogen. Which statement does the law of definite proportions support?
A. Each sample of a single hydrocarbon has the same mass ratio of carbon to hydrogen
B. The mass ratio of carbon to hydrogen is the same for each hydrocarbon
C. No to hydrocarbons have the same mass ratio of carbon to hydrogen
Each hydrocarbon can have several mass ratio of carbon to hydrogen depending on its source

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Erudite1
The correct option is A.
The law of definite proportion states that a given chemical compound always contains its component elements in fixed ratio irrespective of the source they are obtain from.
For instance, water is made up of two atoms of hydrogen and one atom of oxygen. Water can not be formed in any other way. Combining the oxygen and the hydrogen in another ratio will give us another thing not water.