Suppose a chemist has two fatty acids and wants to identify which one is saturated and which one is unsaturated. she has discovered that they have the same chain length. she can identify the saturated fatty acid because it has more
a-carbon atoms.
b-oxygen atoms.
c-hydrogen atoms.
d-nitrogen atoms.

Saturated fatty acid means that all the carbon-carbon bonds are single. So, carbons have the maximum number of hydrogen possible.

Unsaturated fatty acid means that at least one carbon-carbon bond is not single but double. So, the number of hydrogen bonded to carbon atoms is less than the maximum possible.

That the two fatty acids have the same chain length means that they have the same number of carbons. So, the saturated fatty acid will have more hydrogens than the unsaturated fatty acid has.

option C. hydrogen atoms.

Because a model would make the investigation easier to understand