Molarity and Factor Unit Method

The video tutorial explains two main methods for calculating solution concentration: percent and molarity. Percent concentration is defined as the amount of solute over the total solution times 100. Molarity is calculated as moles of solute per liters of solution. The tutorial provides examples of calculating molarity, first using moles and liters, and then a more complex problem using grams and milliliters. The factor unit method is introduced as an alternative approach for solving molarity problems.

What is the general formula for calculating percent concentration?

• Liters over moles

• Moles over liters

• Part over total times 100

• Grams over milliliters

Which of the following is the formula for molarity?

• Grams of solute over liters of solution

• Moles of solute over liters of solution

• Liters of solute over moles of solution

• Percent of solute over total solution

If 0.40 moles of sodium chloride is dissolved in 2.00 liters of solution, what is the molarity?

• 0.40M

• 1.00M

• 0.80M

• 0.20M

When starting with grams, what additional step is needed to calculate molarity?

• Convert grams to liters

• Convert grams to moles

• Convert liters to grams

• Convert moles to grams

What is the first step in the factor unit method?

• Divide by the denominators

• Convert liters to milliliters

• Write down the given numbers and units

• Multiply the numerators

In the factor unit method, what is the purpose of arranging given information in fractional form?

• To simplify the calculation

• To avoid using the periodic table

• To ensure the units cancel out correctly

• To make the problem more complex

What is the molecular weight of sodium chloride used in the factor unit method example?

• 58.5 grams

• 60.0 grams

• 50.0 grams

• 55.5 grams

How many milliliters are there in one liter?

• 100 milliliters

• 500 milliliters

• 1,000 milliliters

• 1,500 milliliters

What is the final molarity calculated using the factor unit method in the example?

• 0.200M

• 0.1513M

• 0.513M

• 0.300M

Which method is suggested as an alternative to the two-step molarity calculation?

• Factor unit method

• Direct conversion method

• Graphical method

• Approximation method