The molecular formula is a chemical formula which indicates the exact number of atoms present in the molecule.
The given molecular formula is [tex]C_{3}H_{8}[/tex] and the name of this molecule is propane consist of three carbon atoms which are linked with eight hydrogen atoms by single bonds.
Now, the figure 1 shows the condensed structural formula, figure 2 shows the structural formula and figure 3 shows the skeletal structural formula of propane.