Question

calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water​

Answer 1

ANSWER:

Mass by mass percentage = (mass of solute / mass of solution) × 100

(mass of the solution: mass of solute + mass of solvent)

Therefore,

mass percent of sodium sulphate solution is 20 %.

Let,

the mass of the solute be 'X'.

mass of water = 100g

So,

as per the given question,

=> 20 =( X/X+100) * 100

=> X = 25

Answer 2

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.