density of a solution

Question

If you dissolve 52.5 g of salt in 3.45 l of water, what is the density of that solution of salty water? In this particular example, assume that the total volume doesn’t change when salt is added to water. I will need the mass of salt and the mass of water to find the mass of the solution of salty water.

Answer 1

If 1 mL of pure water = 1 gram, then 3.45L of water = 3450 mL or 3450 g. The addition of 52.5 g of salt makes the total mass = 3502.5 g. As the volume is assumed not to change, the density (mass/volume) = 3502.5g/3450 mL or 1.02 g/mL.