The mass of NaCl that would be required to make 160 grams of a 12% solution of NaCl in water will be 19 grams.
Solution preparation
A 12% solution of NaCl in water will contain 12 grams of NaCl in 100 mL of water. This solution will weigh 100 grams since 1 mL of water weighs 1 gram.
In order to make 160 grams solution, 160 mL of water would be required. Thus:
12/100 of 160 = 19.2 grams of NaCl
Hence, 160 grams of 12% solution of NaCl would require 19 grams of NaCl approximately.
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