PPT Slide

• Ammonia, water, and carbon dioxide are compounds.

3

• In compounds, the elements are  present in fixed parts by mass.

• Molecules consist of a fixed  number ratio of atoms of the  component elements.

• The mass of any sample of ammonia is  14 parts nitrogen and 3 parts hydrogen.

• One nitrogen atom has 14 times the mass of 1 hydrogen  atom, so mass ratio is 14 (1 nitrogen) to 3 (3 hydrogens)

Previous slide

Next slide

Back to first slide

View graphic version

3