Answer: the volume of this ethanol sample is 19.2 mL
Step-by-step explanation:
The question requires us to determine the volume of a 15.0g sample of ethanol, given its density (0.78 g/mL).
Measurements > Density
The density of a substance is defined as the ratio between its mass and volume:
![density=(mass)/(volume)](https://img.qammunity.org/2023/formulas/chemistry/high-school/kgnupk09rckdiczkzwvqifvdbqdj7w4c9j.png)
We can rearrange the equation above to calculate the volume given the mass of a sample and the density of the substance:
![volume=(mass)/(density)](https://img.qammunity.org/2023/formulas/chemistry/college/l0cx6oq6xntgprs572xsnlg8aetd1oysf7.png)
And, applying the values of mass and density given by the question, we'll have:
![volume=(15.0g)/(0.78g/mL)=19.2mL](https://img.qammunity.org/2023/formulas/chemistry/college/qji7x07qbjv3uirmuyw6oo6kmfxkfcmhaq.png)
Therefore, the volume of this ethanol sample is 19.2 mL.