Question

1.An aqueous solution is made by dissolving 24.6 grams of cobalt(II) nitrate in 342 grams of water. The molality of cobalt(II) nitrate in the solution is ___m.

2. In the laboratory you are asked to make a 0.639 m sodium sulfide solution using 425 grams of water. How many grams of sodium sulfide should you add?
___ grams

3. In the laboratory you are asked to make a 0.550 m ammonium chloride solution using 14.8 grams of ammonium chloride. How much water should you add? ___ grams