College Chemistry
posted by Kim .
How many grams of BaCl2 are needed to make a 250mL of 15% solution?

15% what? 15% w/w, w/v? If 15% w/v, then that means 15 g BaCl2 in 100 mL solution; therefore, for 250 mL you will need
15g x (250/100) = ??