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Molecules of Compounds

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notes

Atoms of different elements join together in definite proportions to form molecules of compounds.

For example, a molecule of water consists of two atoms of hydrogen and one atom of oxygen to form a triatomic molecule H2O.

Molecules of some compounds : 

Compound

Combining Elements

Ratio by Mass

Water (H2O)

Hydrogen, Oxygen

1:8

Ammonia (NH3)

Nitrogen, Hydrogen

14:3

Carbon dioxide (CO2)

Carbon, Oxygen

3:8

notes

Molecules of Compounds:

Atoms of different elements join together in definite proportions to form molecules of compounds.

For example, the ratio by a number of atoms for water is H: O = 2: 1 hence giving rise to formula H2O.

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