How many grams of NaCl would be required to make a 24% NaCl solution if 250 ml of water were used

Answer 1

If it's 24% NaCl w/v and the 250 mL is OF SOLUTION, then
24 g NaCl/100 mL of solution is 24% w/v. Therefore, 24 x (250/100) = g NaCl for 250 mL of solutin.