Question

Ethanol (ethyl alcohol) has a density of 0.789 g/mL at 25°C. If 75.5 g of ethanol is needed for a reaction, what volume in mL should be added to the reaction container?

a. 95.7 mL

b. 59.6 mL

c. 0.0105 mL

d. 78.9 mL

Answer 1

To find the volume of ethanol needed for a reaction from a given mass, divide the mass of ethanol by its density. The correct volume for 75.5 g of ethanol, with a density of 0.789 g/mL, is 95.7 mL.

Step-by-step explanation:

To determine the volume of ethanol needed for a reaction when you have a specific mass, you must use the density formula, which is Density = Mass / Volume. Since the density of ethanol is given as 0.789 g/mL, and we need 75.5 g of ethanol for the reaction, you can rearrange the density formula to find Volume, which is Volume = Mass / Density.

To calculate the volume of ethanol required for the reaction, divide the mass of ethanol by its density:

Volume = 75.5 g / 0.789 g/mL = 95.7 mL

Therefore, the correct volume of ethanol to be added to the reaction container is 95.7 mL.