Finding Molarity: Step-by-Step Practice

The video tutorial 'Science Made Easier' explains how to calculate the molarity of a substance. Molarity is defined as the number of moles of solute per liter of solution. The tutorial provides a basic example with 2 moles of solute in 1 liter of solution, resulting in a molarity of 2. It then progresses to a more complex example involving 58.4 grams of sodium chloride dissolved in 500 milliliters of solution. The video guides viewers through converting grams to moles using molecular weight and calculating molarity, emphasizing the importance of understanding both moles and liters in the process.

What is the definition of molarity?

• Moles of solute per kilogram of solvent

• Moles of solute per liter of solution

• Grams of solute per liter of solution

• Liters of solution per mole of solute

What is the first step in calculating molarity?

• Find the volume of the solution in liters

• Determine the moles of solute

• Calculate the weight of the solute

• Measure the density of the solution

What does the molarity calculation involve?

• Adding moles of solute to liters of solution

• Dividing moles of solute by liters of solution

• Dividing grams of solute by liters of solution

• Multiplying moles of solute by liters of solution

In the first example, if you have 2 moles of solute in 1 liter of solution, what is the molarity?

• 4 M

• 0.5 M

• 1 M

• 2 M

What unit is used for the volume of solution in molarity calculations?

• Milliliters

• Gallons

• Liters

• Cubic meters

How do you convert grams of a substance to moles?

• Multiply by the molecular weight

• Subtract the molecular weight

• Add the molecular weight

• Divide by the molecular weight

What is the molecular weight of sodium chloride (NaCl)?

• 58.44 g/mol

• 35.45 g/mol

• 23.00 g/mol

• 100.00 g/mol

How many moles are 58.44 grams of NaCl?

• 1.5 moles

• 1 mole

• 0.5 moles

• 2 moles

What is the molarity of a solution with 58.44 grams of NaCl dissolved in 500 mL of solution?

• 1.5 M

• 2 M

• 0.5 M

• 1 M

If you have 1 mole of solute in 0.5 liters of solution, what is the molarity?

• 0.5 M

• 1 M

• 4 M

• 2 M