Dalton's law of partial pressures
Grade 10 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
A balloon holds 0.2 mol of O₂ and 0.8 mol of N₂ at 1.2 atm. What is the partial pressure of O₂, to 0.01 atm, Esme?
A sealed syringe holds 0.03 mol of CO₂ and 0.07 mol of air at 2 atm. What is the partial pressure of the CO₂, to 0.01 atm, Jun?
A tank holds 0.5 mol of O₂ and 1.5 mol of N₂ at 100 kPa. What is the partial pressure of O₂, to 0.01 kPa, Kira?
Jun says air is mostly oxygen, since we breathe it. Which reply fits, Luz?
- Agree: oxygen is about 78% of the air, and nitrogen about 21%
- Agree: air is about half oxygen
- Disagree: dry air is about 78% nitrogen and 21% oxygen
Esme says the oxygen in air pushes with the full 101.325 kPa. Which reply fits, Milo?
- Agree: each gas in a mix pushes with the full total pressure
- Agree: oxygen is the main gas, so it pushes hardest
- Disagree: oxygen's partial pressure is about 21.2 kPa
Kira says the heavier gas in a mix has the higher partial pressure. Which reply fits, Noah?
- Disagree: partial pressure follows moles, not mass
- Agree: heavier particles hit the walls harder, so they push more
- Agree, if the mix is inside a tire
A tire's air totals 330 kPa (absolute). If O₂ is 69.1 kPa, what do the other gases add up to, Ren?
- 260.9 kPa
- 330 kPa, the total itself
- 399.1 kPa, from 330 + 69.1
A sealed syringe holds 0.3 mol of O₂ and 0.9 mol of N₂ at 1.20 atm. What is the partial pressure of N₂, Tala?
- 0.4 atm, from 1.20 ÷ 3
- 0.3 atm, the O₂ share
- 0.9 atm, from 0.75 × 1.20
Why do NOAA's dry-air shares add up to about 100%, Zee?
- Nitrogen alone makes up 100%
- They add to 78%, the nitrogen share
- Together they make up the whole of dry air
A tank holds equal moles of N₂, O₂ and CO₂ at 3.0 atm in total. What is each gas's partial pressure, Bo?
- 1.0 atm each
- More for the CO₂, since it is heaviest
- 3.0 atm each