Final answer:
The density of polypropylene cannot be calculated with the given volume alone; the mass of the polypropylene is also required. Density is determined using the formula Density = Mass/Volume, which is frequently employed in chemistry for calculations involving mass, volume, and substance identification.
Step-by-step explanation:
To find the density of polypropylene, we need to know both its mass and volume. However, the question provided only the volume of the polypropylene as 37.8 ml. Without the mass of the polypropylene, we cannot calculate its density directly. Nevertheless, density can be found using the formula Density = Mass/Volume. In chemistry, the density of substances is commonly used to identify them or to convert between mass and volume. For example:
- If we have a mass of 50.0 g and a known density of 2.70 g/cm³, we can calculate the volume using the formula Volume = Mass/Density.
- In contrast, if the volume and density are known, we can find the mass by rearranging the formula to Mass = Density × Volume.
Applying this concept to the provided density of 2.70 g/cm³, we can perform calculations like:
- Finding the mass of a sample given its volume of 2.49 cm³.
- Determining the volume for a different sample with a mass of 50.0 g.
Remember, the density of a liquid can similarly be calculated, as shown in the 'Check Your Learning' example with a mass of 31.1415 g and a volume of 30.13 cm³.
Moreover, the density concept can also be applied to situations involving buoyancy and the percentage of an object floating above a liquid, as demonstrated in the cases with polystyrene and water, and further explored with the addition of a mass or change in liquid density with ethyl alcohol.