BACE 4.4 Molarity Quiz S25

Honor Pledge: I promise, on my honor, that I am taking this quiz while upholding all tenets of academic honesty.

• yes

• no (don't)

A mole of Oxygen gas (O₂) contains
6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules
• moles

What is the molar mass of one molecule of methane, CH₄?

• 16.0 g

• 10.0 g/mol

• 12.001 amu

• 48.0 g/mol

• None of these options are correct.

How many moles of NaOH would be found in 60g of NaOH?

• 60 mol

• 1.5 mol

• 0.67 mol

• 240 mol

• None of these options are correct.

Find the mass, in grams, of 5.5 moles of carbon dioxide (CO₂).

• 5.5 grams

• 242 grams

• 121 grams

• 44.01 grams

• None of these options are correct.

Calculate the molarity of the following solution:
2.2 mole of NaCl in 1.8 L of solution.

• 1.22 M

• 2.2 M

• 3.96 M

• 0.82 M

• None of these options are correct.

What is the molarity of a solution that contains 128.6 g NaCl in 4.00 L of solution?

• 58.44 M NaCl

• 2.2 M NaCl

• 8.8 M NaCl

• 1,879 M NaCl

• None of these options are correct.

How many moles are needed to make 3.0 L of a 2.5 M solution of KMnO₄? 

• 7.5 mol

• 1.2 mol

• 0.833 mol

• 0.047 mol

• None of these options are correct.

How many grams of NaOH are required to prepare 0.75L of a 1.5M solution?

• 45 grams

• 80 grams

• 0.0125 grams

• 2 grams

• None of these options are correct.

When making solutions in the lab, which of the following practices should you always do? (Choose all that apply.)

• Use a weigh boat or paper when using an electronic balance to keep it clean.

• Mix the solute into about 80% of the solvent at first.

• Use the most accurate and precise tools available to measure liquid volumes.

• Double-check your calculations before measuring out solute and solvent.

• Label the prepared solution with name, concentration, date, and any hazard warnings.