Calculate the amount of solution (g or mL) that contains each of the following amounts of solute:
a. 7.50 g of NaCl from a 2.0% (m/m) NaCl solution
b. 4.0 g of NaOH from a 25% (m/m) NaOH solution
c. 20.0 mL of ethanol from a 8.0% (v/v) ethanol solution
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