Final answer:
To calculate the weight of 55.0 mL of ethanol, multiply the volume by the density of ethanol. In this case, 55.0 mL of ethanol will weigh approximately 43.395 grams.
Step-by-step explanation:
To calculate the weight of 55.0 mL of ethanol, we need to use the given density. Density is defined as mass divided by volume. In this case, the density of ethanol is 0.789 grams per milliliter.
So, we can calculate the weight by multiplying the volume in milliliters (55.0 mL) by the density (0.789 g/mL):
Weight = 55.0 mL * 0.789 g/mL = 43.395 g
Therefore, 55.0 mL of ethanol will weigh approximately 43.395 grams.