A solution is preapared by adding 2g of a substance A to 18g of water calculate the mass per cent of the solute

Answer 1

Mass percent is the mass of solute / total mass of solution (x100%)

mass of solute = 2 g

mass of solution = 2 g + 18 g = 20 g

Mass percent = 2 g / 20 g (x100%) = 10%