Molarity and Unit Conversions

This video tutorial explains how to use molarity as a conversion factor to calculate the number of moles or volume in a solution. It covers four problems involving different substances: NaCl, glucose, FeCl3, and NaOH. The tutorial demonstrates how to convert between grams, moles, and liters, emphasizing the importance of unpacking molarity into moles per liter and flipping conversion factors when necessary.

What does a 1.5 M solution indicate in terms of moles and liters?

• 1.5 grams per liter

• 1.5 moles per 2 liters

• 1.5 moles per 1 liter

• 1.5 liters per mole

How many moles of NaCl are in 3.5 liters of a 1.5 M solution?

• 5.3 moles

• 1.5 moles

• 3.5 moles

• 7.0 moles

If you have 4.1 moles of glucose, what is the volume of a 0.25 M solution?

• 25 liters

• 10 liters

• 16 liters

• 20 liters

What is the first step in converting grams to liters using molarity?

• Convert grams to moles

• Convert grams to milliliters

• Convert liters to moles

• Convert moles to grams

How many liters are needed to make a 1.5 M solution with 35.0 grams of FeCl3?

• 0.50 liters

• 0.35 liters

• 0.21 liters

• 0.14 liters

What is the molar mass of NaOH used for conversion?

• 30 grams per mole

• 50 grams per mole

• 40 grams per mole

• 20 grams per mole

How many grams of NaOH are needed to make 725 mL of a 2.5 M solution?

• 90 grams

• 100 grams

• 50 grams

• 72 grams

What is the conversion factor for milliliters to liters?

• 1 mL = 1000 L

• 1 mL = 0.01 L

• 1 mL = 0.001 L

• 1 mL = 0.1 L

What is the final step in converting moles to grams?

• Multiply by the molar mass

• Add the molar mass

• Divide by the molar mass

• Subtract the molar mass

What is the significance of flipping the conversion factor?

• To convert grams to liters

• To simplify the calculation

• To ensure units cancel out correctly

• To convert liters to grams