Gas volume and moles at standard conditions
Grade 10 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
A balloon at STP (0 °C, 1 atm) holds 44.8 L of carbon dioxide. One mole of gas fills 22.4 L there. How many moles is that, Ari?
A plant gives off 11.2 L of oxygen at STP (0 °C, 1 atm). One mole of gas fills 22.4 L there. How many moles is that, Bo?
A box at STP (0 °C, 1 atm) holds 67.2 L of air. One mole of gas fills 22.4 L there. How many moles of gas is that, Kira?
At STP, which fills more space: 1 mol of CO₂ or 1 mol of O₂, Luz?
- The CO₂, since its molecules are heavier
- Neither: each fills 22.4 L
- The O₂, since its molecules are lighter
Why do 1 mol of O₂ and 1 mol of CO₂ fill the same volume at STP, Milo?
- Heavier molecules squeeze closer together
- Both gases have the same molar mass
- Gas particles are far apart, so their size barely matters
On the mole map, which step turns moles of a gas at STP into liters, Pia?
- Multiply by 22.4 L/mol
- Divide by 22.4 L/mol
- Multiply by the molar mass
Which setup changes 33.6 L of CO₂ at STP into moles, Ren?
- 33.6 L ÷ (6.022 × 10²³)
- 33.6 L × (1 mol ÷ 22.4 L)
- 33.6 L × (22.4 L ÷ 1 mol)
What does STP mean on these sheets, Tala?
- Standard temperature and pressure: 0 °C and 1 atm
- A steady temperature kept in a sealed pot
- Standard temperature and pressure: 25 °C and 1 atm
Can you use 22.4 L/mol for a balloon of CO₂ at 25 °C, Zee?
- Yes, as long as the gas is CO₂
- No: 22.4 L/mol holds at 0 °C and 1 atm
- Yes: 22.4 L/mol works at any temperature
IUPAC's standard uses 0 °C and 100 kPa. What molar volume goes with it, Esme?
- About 2.27 L/mol
- About 22.7 L/mol
- 22.4 L/mol, the same as at 1 atm