How to calculate the mass of water?

If you put water into Copper Sulphate, the mass of the water won't change. If you are looking for percent composition, divide the mass of the water by the mass of the entire solution.

Example if you have 10.0ML of water then The definition of a Kilogram (Kg) is 1 litre of pure water at room temperature.Each cubic centimetre or millilitre (ml meaning 1000th of a litre) is therefore...

You know that the density of pure water is 1g/cm3. If you also know the volume of the water, you can multiply the two and get the mass.

You add water to the container then you stir, the water and salt would form a solution and sand would settle on the bottom of the container. You get another container and place on a filter paper then...

18.02 grams per Mole