Grade 10 · Science · Chemistry

10th grade The mole: counting particles worksheet

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The mole: counting particles

Grade 10 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Each water molecule (H₂O) has 2 hydrogen atoms. How many moles of hydrogen atoms are in 3 mol of water, Bo?
Each carbon dioxide molecule (CO₂) has 2 oxygen atoms. How many moles of oxygen atoms are in 1.5 mol of CO₂, Esme?
Each glucose molecule (C₆H₁₂O₆) has 6 carbon atoms. How many moles of carbon atoms are in 0.25 mol of glucose, Jun?
4.
How many water molecules are in 2 mol of water, Kira?
- 1.2044 × 10²³
- 1.2044 × 10²⁴
- 3.011 × 10²³
5.
How many sugar molecules are in 3 mol of sugar, Milo?
- 2.007 × 10²³
- 1.8066 × 10²⁴
- 1.8066 × 10²³
6.
A spoon of salt and a spoon of sugar each hold 0.1 mol. Which is true, Noah?
- The heavier spoonful holds more particles
- They hold the same number of particles
- They have the same mass, since both are 0.1 mol
7.
Why can 1 mol of salt (58.44 g) weigh more than 1 mol of water (18.02 g), Ren?
- Moles of different substances have equal masses, so the scale is wrong
- A mole of salt holds more particles than a mole of water
- Each salt unit is heavier than a water molecule
8.
How many moles of atoms in total are in 1 mol of CO₂, Tala?
- 2 mol, counting just the O atoms
- 3 mol: 1 mol C and 2 mol O
- 1 mol, one for each molecule
9.
How many moles of oxygen atoms are in 2 mol of baking soda (NaHCO₃), Zee?
- 3 mol
- 6 mol
- 2 mol
10.
How many moles of hydrogen atoms are in 0.5 mol of glucose (C₆H₁₂O₆), Ari?
- 0.5 mol
- 6 mol
- 12 mol

The mole: counting particles with Avogadro's number. Every version has 10 questions, and the answer key prints on the second page.

I can say what a mole is: a count of 6.022 × 10²³ particles, the way a dozen is 12.
I can change particles to moles (divide by 6.022 × 10²³) and moles to particles (multiply).
I can find the moles of atoms in a sample from its formula, and keep powers of ten straight.

Standard: HS-PS1-7

mole: A count of 6.022 × 10²³ particles

Avogadro's number: 6.022 × 10²³, the number of particles in one mole

particle: One atom, molecule or formula unit

molecule: A group of atoms joined together, like H₂O

subscript: The small number telling how many of an atom are in a formula

Your child divided the wrong way. Moles = particles ÷ (6.022 × 10²³), so a count under one mole gives less than 1 mol.

Your child treated a mole as a mass. A mole is a count, 6.022 × 10²³ particles, the way a dozen is 12.

Your child thought a mole of anything has the same mass. Each mole has the same count, but heavier particles make a heavier mole.

What is the most common mistake with the mole: counting particles?

Your child divided the wrong way. Moles = particles ÷ (6.022 × 10²³), so a count under one mole gives less than 1 mol.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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