ANSWER ANY THAT YOU CAN THANK YOU SO MUCH! 14. A chemist wants to make Co(OH)2 according to the following reaction: CoCl2 (aq) + 2NaOH (aq) → Co(OH)2 (s) + 2NaCl (aq) If the student uses 167.4 mL of a 1.39 M solution of NaOH and an excess of CoCl2, how many grams of Co(OH)2 will be formed?

15. A chemist wants to make 150.0 grams of BaCO3 using the following reaction: Ba(NO3)2 (aq) + K2CO3 (aq) → BaCO3 (s) + 2KNO3 (aq) If she has an excess of K2CO3, what volume of a 2.56 M solution of Ba(NO3)2 will she need to use?

16. Of the two concentration units you learned in this chapter, which is more like a ratio of the amount of solute to the amount of solvent?

17. You make a solution by mixing 67.8 grams of KCl with 450.0 grams of water. What is the molality of the solution?

18. A chemist makes a 2.34 m solution by mixing 23.1 g of MgCl2 with water. How many kilograms of water were used?