Need step by step : Calculate % by mass of 17.25g KCl in 435 mL of H2O?

Question

Do you have to convert mL to g in this problem. If so, I know that you use D=M/V but not sure how that fits into the overall answer.

Also, the same method above doesn't work with 0.25 g of Phenolphthalein in 275 ml of ethanol. These problems appear to be the same but I don't get the correct answers treating them as such.

Answer 1

There is some essential information still missing.
1) When you say "17.25g KCl in 435 mL of H2O", do you provide the information if the solution volume would increase/ decrease by dissolve 17.25g KCl?
2) What is the solution density after dissolving KCl?