Mole Concept

What is a mole in chemistry?

• A) A small burrowing mammal
• B) A unit that measures mass
• C) A quantity that represents 6.022 × 10²³ particles of a substance
• D) A unit used to measure volume

What is Avogadro's number?

• A) 3.14 × 10²³
• B) 6.022 × 10²³
• C) 1.00 × 10²⁴
• D) 9.81 × 10²²

How many moles are in 18 grams of water (H₂O)? (Molar mass of H₂O = 18 g/mol)

• A) 1 mole
• B) 0.5 moles
• C) 2 moles
• D) 1.8 moles

What is the molar mass of carbon dioxide (CO₂)? (Atomic masses: C = 12, O = 16)

• A) 28 g/mol
• B) 32 g/mol
• C) 44 g/mol
• D) 48 g/mol

What is the molar mass of oxygen gas (O₂)? (Atomic mass of O = 16)

• A) 16 g/mol
• B) 32 g/mol
• C) 24 g/mol
• D) 48 g/mol

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

• A) Moles = Mass × Molar Mass
• B) Moles = Mass / Molar Mass
• C) Moles = Molar Mass / Mass
• D) Moles = Volume × Molar Mass

One mole of any substance contains the same number of particles as one mole of any other substance.

• A) True
• B) False

The molar mass of a substance depends on the number of moles of the substance.

• A) True
• B) False

What is the molar mass of sodium chloride (NaCl)? (Atomic masses: Na = 23, Cl = 35.5)

• A) 56.5 g/mol
• B) 58.5 g/mol
• C) 60.5 g/mol
• D) 54.5 g/mol

How many grams are in 2 moles of glucose (C₆H₁₂O₆)? (Molar mass of C₆H₁₂O₆ = 180 g/mol)

• A) 90 g
• B) 180 g
• C) 360 g
• D) 540 g