I showed one of the other kids my question and he called me a jackass and said it was way too hard. I showed it to some really geek kid and he said the units don't match up or something. I want to see if either one was right. Here's the question. A solution composed of an unknown salt dissolved in water has a % mass of 5 times its molality. If there are 252 g of the salt dissolved in 1.5 liters of water what is the salt? a. Sodium Hydroxide (NaOH) b. Calcium carbonate (CaCO3) c. Sodium chloride (NaCl) d. Potassium Hydroxide (KOH) Is it grievously flawed or too esoteric?

Its easy since you can find percent mass without knowing the salt.

Its just 252/1752(100%)...so the molality has to be one fifth of that. So you need to see which salt that has a molar mass that will give you a molality of 2.87671232. #mols = 4.31506848 from 252 grams. Molar mass is 58.40...NaCl.

I cant remember my AP Chem test...but this is considered "easy" for the MCAT.

How would you even dissolve 252g of calcium carbonate in 1.5L of water?