Question

a student adds 3 spoons of salt to 100 ml of water. the solution is clear, with nothing on the bottom of the cup. one spoon of the slat ha a mass of 5g. what is the mass of the solution? after the water evaporates, what is the mass of the solid remaining in the cup?

Answer 1

If the density of the water is 1.00 g/mL, then 100 mL has a mass of 100 g. That + 3*5 = 15 g salt added make the solution's mass = 115 g. When all of the water is evaporated the mass of the salt remaining is 15 g.