Chemistry homework help !!!?

Question

A flask that can hold 158 g of water at 4 degrees Celsius can hold only 127 g of ethanol. What's the density of ethanol ?

Answer 1

At 4 degrees C, water density is 1 g/cm^3.

Density(ethanol) = 127/158 * 1 g/cm^3 = 0.804 g/cm^3

ETA as mentioned in my e-mail to you:

Density(ethanol) = Mass(ethanol)/Volume(flask)

Density(water) = Mass(water)/Volume(flask) = 1 g/cm^3

158g / Volume(flask) = 1 g/cm^3

Volume(flask) = 158 cm^3

Density(ethanol) = 127 g / 158 cm^3  = 0.804 g/cm^3