An empty erlenmeyer flask weighs 241.3 g. when filled with water (d=1.00 g/cm3), the flask and its contents weigh 489.1 g. what is the volume of water in the flask?
Flask + water = 489.1g
mass of water is 489.1 - 241.3 = 247.8g
Use the density of water to find the volume:
247.8g/(1cm^3/1.00g) = 247.8cm^3 is the volume of the flask also because that volume of water fills the flask.