Molarity Practice Problems: Calculating Concentration

What is the formula to calculate molarity?

• Molarity = grams of solute / liters of solution

• Molarity = liters of solution / moles of solute

• Molarity = moles of solute / liters of solution

• Molarity = moles of solute * liters of solution

What is the molarity of a solution made by dissolving 9.8 moles of NaOH in 3.62 liters of water?

• 1.5 M

• 9.8 M

• 2.71 M

• 3.62 M

What does a molarity of 2.7 M indicate about a solution?

• It contains 2.7 liters of solute per mole of solution

• It contains 2.7 grams of solute per liter of solution

• It has a volume of 2.7 liters

• It contains 2.7 moles of solute per liter of solution

How do you convert grams to moles?

• Multiply by the molar mass

• Divide by the molar mass

• Divide by Avogadro's number

• Multiply by Avogadro's number

What is the molarity of a CuCl2 solution prepared by dissolving 152.5 grams in 2.25 liters of water?

• 152.5 M

• 0.504 M

• 1.134 M

• 2.25 M

What is the first step in calculating the molarity of a solution when given the mass of the solute?

• Convert liters to milliliters

• Convert grams to moles

• Calculate the volume of the solution

• Determine the molar mass of the solvent

What is the molar mass of CuCl2 if copper's atomic mass is 63.55 and chlorine's is 35.45?

• 63.55 g/mol

• 70.90 g/mol

• 99.00 g/mol

• 134.45 g/mol

What is the molarity of a solution prepared by dissolving 42.5 grams of NaCl in 375 mL of water?

• 42.5 M

• 0.727 M

• 1.94 M

• 375 M

How do you convert milliliters to liters?

• Multiply by 1000

• Divide by 1000

• Multiply by 100

• Divide by 100

What conversion factor is used to convert grams of NaCl to moles?

• 58.44 g/mol

• 22.99 g/mol

• 35.45 g/mol

• 100 g/mol