The mole: counting particles
Grade 10 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
A big balloon holds 1.2044 × 10²⁴ CO₂ molecules. One mole is 6.022 × 10²³. How many moles is that, to 0.01 mol, Jun?
A bag of sugar holds 2.4088 × 10²⁴ sugar molecules. One mole is 6.022 × 10²³. How many moles is that, to 0.01 mol, Kira?
Kira says 1 mol of salt and 1 mol of sugar have the same mass. Which reply fits, Luz?
- Agree: a mole is a mass, like a kilogram
- Disagree: same count, but sugar molecules are heavier
- Agree: a mole of any substance has one fixed mass in grams
Jun says 6.022 × 10²³ is a large number picked at random. Which reply fits, Milo?
- Disagree: it was set to match 12 g of carbon-12
- Agree: scientists picked it at random
- Agree: it changes each year with new data
Esme says 2 mol of water holds twice as many molecules as 1 mol of sugar. Which reply fits, Noah?
- Disagree: a mole of each substance has the same mass, so they match
- Agree: 2 mol is twice the count of 1 mol
- Disagree: sugar's heavier molecules mean more of them
How many oxygen atoms are in 1 mol of CO₂, Ren?
- 1.2044 × 10²³
- 6.022 × 10²³
- 1.2044 × 10²⁴
How many atoms in total are in 0.5 mol of CO₂, Tala?
- 9.033 × 10²²
- 9.033 × 10²³
- 3.011 × 10²³
Which holds more molecules: 2 mol of water or 1 mol of glucose, Zee?
- 1 mol of glucose, since its molecules are heavier
- They match, since both samples are measured in moles
- 2 mol of water, since 2 mol is the larger count
Which holds more atoms: 1 mol of water or 1 mol of CO₂ (3 atoms in each molecule), Ari?
- They match: 3 mol of atoms each
- CO₂, since its molecules are heavier
- Water, since its molecules are lighter and pack in
A sample holds 3.011 × 10²³ glucose molecules. How many moles is that, and is it more or less than 1 mol, Bo?
- 5 mol, more than 1 mol
- 0.5 mol, less than 1 mol
- 0.5 g, less than 1 g
