Mole Concept and Calculations Worksheet

What is the definition of a mole in chemistry?

• A unit of volume

• A unit of mass

• The number of particles in 12 grams of carbon-12

• The number of atoms in a gram of an element

How many particles (atoms, molecules, or ions) are in one mole of a substance?

What is the molar mass of carbon (C)?

• 12 g/mol

• 1 g/mol

• 6 g/mol

• 24 g/mol

How many moles are in 18 grams of water (H₂O)?

• 0.5 mol

• 1 mol

• 2 mol

• 3 mol

What is the molar mass of sodium chloride (NaCl)?

• 58.44 g/mol

• 22.99 g/mol

• 40.00 g/mol

• 35.45 g/mol

Which of the following is the correct number of atoms in 3 moles of gold (Au)?

• 1.81×10^24 atoms

• 3×10^23 atoms

• 1.81×10^23 atoms

How do you calculate the number of moles from the number of particles?

• Multiply the number of particles by the molar mass

Which of the following is true about the mole concept?

• The mole is used to relate macroscopic quantities of a substance to microscopic particles.

• The mole is only used for gases.

• The mole is a unit for measuring volume, not mass.

• The number of moles is irrelevant when calculating molecular formulas.

Tags

NGSS.HS-PS1-7

How many molecules are in 2 moles of nitrogen gas (N₂)?

What is the mass of 0.5 moles of carbon dioxide (CO₂)?

• 22 g

• 44 g

• 11 g

• 88 g