Chemistry Quiz on Moles

What is the definition of a mole in chemistry?

• A unit of mass

• A unit of volume

• A unit for counting particles, equal to 6.022×10^23 entities

• A measure of temperature

Which of the following represents Avogadro's number?

• 121212

• 1.6×10−19

• 6.02×10^23

• 1.0×10^24

What is the molar mass of carbon dioxide (CO₂)?

• 22 g/mol

• 44 g/mol

• 32 g/mol

• 28 g/mol

How many grams are in 3 moles of sodium chloride (NaCl)? (Molar mass of NaCl = 58.5 g/mol)

• 58.5 g

• 117 g

• 175.5 g

• 50 g

If you have 222 moles of a substance, how many molecules do you have?

• 6.022×10^23

• 1.2044×10^24

• 222

• 333

What is the relationship between mass, moles, and molar mass?

• Mass = Moles × Molar Mass

• Molar Mass = Mass / Moles

• Moles = Mass / Molar Mass

• All of the above are correct.

Which of the following contains the highest number of moles in 10 grams?

• Water (H₂O)

• Ethanol (C₂H₅OH)

• Methane (CH₄)

• Oxygen (O₂)

What is the primary use of the mole concept in chemistry?

• To measure temperature

• To balance chemical equations

• To convert between mass and number of particles

• To calculate the density of a substance

If you have 4 moles of aluminum (Al), how many atoms do you have?

• 2.41×10^24 atoms

• 4.84×10^24 atoms

• 6.022×10^23 atoms

• 1.2×10^24 atoms

If 16 grams of methane (CH₄) are present, how many moles of methane do you have? (Molar mass of CH₄ = 16 g/mol)

• 1 mole

• 2 moles

• 0.5 moles

• 4 moles