please help! density equation!

Question

If you dissolve 300 g of salt in 10 litres 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. You will need the mass of salt and the mass of water to find the mass of the solution of salty water. Don’t forget to show your working and include units.

Answer 1

mass of salt = 300 g

mass of water = 10 liters x 1000 mls/liter x 1 g/ml = 10,000 g (assuming a density of 1g/ml for water)

total mass = 10,000 g + 300 g = 10,300 g = 10.3 kg

total volume = 10 L 

Density = 10.3 kg/10 L = 1.03 kg/L