Important chemistry question I am struggling with! 2 parts!

Question

What is the molarity of a solution that contains 27g of NH3 in 1500 mL or solution?

How many grams of copper (II) chloride would you need to make 2 L of a 0.600 M copper (II) chloride solution?

Answer 1

First you need to find the number of moles that you have of NH3. You can do this using the molar mass of NH3 (14 + 1 + 1)g/mol. SInce you have 27 grams, use 16g/mol to convert to moles. Now that you have moles, use the volume given to find the molarity (moles per liter).

For the second question, you know the volume and the molarity and need to find the grams. The molecular mass of CuCl2 is 124.45g/mol. You know you have two liters, so therefore 1.2 moles of CuCl2. You can then convert that to grams using the molecular mass.

Does this make sense?