The mole: counting particles
Grade 10 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
A sip of water holds 3.011 × 10²³ water molecules. One mole is 6.022 × 10²³ molecules. How many moles is the sip, to 0.01 mol, Ari?
A party balloon holds 9.033 × 10²³ molecules of carbon dioxide (CO₂). One mole is 6.022 × 10²³ molecules. How many moles is that, to 0.01 mol, Bo?
What is one mole, by NIST's definition, Jun?
- The mass of one gram of a substance
- Exactly 6.022 140 76 × 10²³ particles
- The amount of a substance that fills one liter
A mole is a counting unit, like a dozen. How many particles are in one mole, to four significant figures, Luz?
- 6.022 × 10²³ particles
- 6.022 × 10²³ grams
- 12 particles, like a dozen
Which of these is a count of particles, Milo?
- 2 moles of water molecules
- 2 grams of water
- 2 liters of water
On the mole map, which step turns moles into particles, Pia?
- Divide by 6.022 × 10²³
- Multiply by 6.022 × 10²³
- Add 6.022 × 10²³ to the moles
Which line turns 1.2044 × 10²⁴ molecules into moles, Ren?
- 1.2044 × 10²⁴ ÷ (6.022 × 10²³) = 2 mol
- 1.2044 × 10²⁴ − 6.022 × 10²³ = 6.022 × 10²³ mol
- (6.022 × 10²³) ÷ (1.2044 × 10²⁴) = 0.5 mol
A dozen eggs and a dozen bricks hold the same count. What is true of 1 mol of water and 1 mol of salt, Tala?
- They have the same mass, since both are one mole
- They hold the same number of particles
- They take up the same space, since both are one mole
One mole of water has a mass of 18.02 g. Does 1 mol of sugar (C₁₂H₂₂O₁₁) also have a mass of 18.02 g, Zee?
- No; heavier molecules make a heavier mole
- Yes; a mole is a mass, not a count
- Yes; one mole of any substance has a mass of 18.02 g
How many eggs are in 2 dozen, and how many molecules are in 2 mol, Esme?
- 24 eggs; 1.2044 × 10²⁴ molecules
- 24 eggs; 6.022 × 10²³ molecules
- 24 eggs; 2 grams of molecules