The mass of the solution is 50 grams;
To find the mass of alkali, it is necessary to multiply its mass fraction by the mass of the solution.
m alkali = 50 x 0.16 = 8 grams;
To find the mass of water, it is necessary to subtract the mass of alkali from the mass of the solution:
m water = 50 – 8 = 42 grams;
Check: 8 + 42 = 50;
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