an empty RD bottle weighs 75g but weighs 150g when completely filled with water when the bottle is completely filled with benzene it weighs 90g calculate the volume of the RD bottle.

It is urgent....Please

volume = mass/density

isn't water 1g/cm^3 ?
so, you have 75g of water
looks like 75cm^3 to me, regardless of how much the benzene weighs.