Calculate what mass of salt and what volume of water will be required to prepare a solution of 250 g with a mass fraction of 20% sodium chloride.
The mass of the solution is 250 grams;
To find the mass of salt, it is necessary to multiply its mass fraction by the mass of the solution.
m salt = 250 x 0.2 = 50 grams;
To find the mass of water, subtract the mass of salt from the mass of the solution:
m of water = 250 – 50 = 200 grams;
Check: 200 + 50 = 250;
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