Question

Calculate the mass of sodium sulphate required to prepare its 20% (mass percent)

solution in 100g of water?​

Answer 1

Answer:

Given that the mass percent of sodium sulphate solution is 20%. Let the mass of sodium sulphate which is required to prepare this solution be x grams. Given that the mass of water is 100 g. Thus, 25g of sodium sulphate is required

Answer 2

Answer:

25 g

Step-by-step explanation:

Let the mass of sodium sulphate required be = x g

Mass of solution = mass of solute + mass of solvent =( x + 100)g

x g of solute in (100 + x) g of solution

20% = (x/100) × 100

20x + 2000 = 100x

2000 = 100x - 20x

2000 ÷ 80 = x

25 g = x