Question

A colorless liquid is thought to be a pure compound. Analysis of three samples of the material yield the following results.
Mass of Sample Mass of carbon Mass of Hydrogen
Sample 1 1.0 g 0.862 g 0.138 g
Sample 2 1.549 g 1.335 g 0.214 g
Sample 3 0.988 g 0.852 g 0.136 g

Could the material be a pure compound?

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Answer

Analysis

Mass of Carbon + Mass of Hydrogen = Mass of Sample
Sample 1 0.862 g + 0.138 g = 1.0 g
Sample 2 1.335 g + 2.214 g = 1.549 g
Sample 3 0.852 g + 0.136 g = 0.988 g

Yes, the material is a pure compound as all the three samples have the same composition.

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