Final answer:
The correct answer to the question of which drawing is a structural model of C3H8 is option B. Structural propane, which shows how atoms are connected with lines representing chemical bonds.
Step-by-step explanation:
The question asks which drawing represents a structural model of C3H8, which is the chemical formula for propane. Four different types of representations are mentioned: Skeletal, Structural, Ball and Stick, and Space Filling. Among the given options for representing the molecule of propane, the correct answer is B. Structural propane. A structural model shows how each of the atoms in a molecule is connected to the others, usually with lines representing chemical bonds. This is contrasted with a skeletal model which only shows the framework of the carbon backbone, a ball-and-stick model which represents atoms as spheres and bonds as rods, and a space filling model which depicts the relative sizes of atoms without showing explicit bonds.
A structural model would be similar to the representation used in Figure 4.6.3b, where atoms are not drawn as spheres but rather connected with lines to depict bonds. This can be compared with the ball-and-stick model in Figure 2.16c, as well as the space-filling model in Figure 2.16d. Chemists also often use a condensed structural formula, such as in Figure 4.6.3f, although this is not one of the options provided in the question.