Unit 11 BR #3: Solution Molarity

What does "like dissolves like" mean?

• polar solvents dissolve in polar solutes

• polar solutes dissolve in polar solvents

• non-polar solvents dissolve in polar solutes

• non-polar solutes dissolve in polar solvents

Calculate the molarity of the following solution:

0.521 mol of NaCl in 125 mL

(Molar mass of NaCl is 58.44 g/mol)

• 4.17M

• 0.00417M

• 65M

• 0.240M

Calculate the molarity of the following solution:

5.63 grams of NaCl in 350 mL

(Molar mass of NaCl is 58.44 g/mol)

• 0.016M

• 62.2 M

• 0.275M

• 9.40M

Calculate the molarity of the following solution:

4.25 g CuCl2 in 125 mL

(The molar mass of CuCl2 is 134.45 g/mol)

• 0.253M

• 0.034M

• 1.08M

• 4.57M

Calculate the number of moles present in the following solution:

127mL of 0.105 M HNO3

• 0.0133 mol

• 13.3 mol

• 0.000827 mol

• 0.827 mol

Calculate the number of moles present in the following solution:

155 mL of 15.1 M NH3

• 2.34 mol

• 0.097 mol

• 10.2 mol

• 139.9 mol

Calculate the mass in grams present in the following solution:

155 mL of 15.1 M NH3

(molar mass of NH3 = 17.04 grams = 1 mol)

• 137 g

• 39.9 g

• 17.4 g

• 0.175 grams