Weight of sugar= final volume (or weight) x (%/100) i.e., = 400gx20/ 100= 80g. Take 80g of sugar and add solvent to the same container 'till the total mixture (sugar + water) weigh upto 400 g. I hope this calculation works for you. Thanks for watching 🙏
You are absolutely correct sir the only condition is (mass = volume x density) density of solute should be 1gm/ cm3 for (1g = 1ml). Just to avoid this density condition we say first take solute and after dissolution in small amount of solvent, make up the solution up to desired volume. Thanks for watching and supporting with your opinion🙏
