Gas volume and moles at standard conditions

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   A balloon holds 22.01 g of CO₂ (44.01 g/mol) at STP (0 °C, 1 atm, 22.4 L/mol). What volume is that, to 0.01 L, Esme?

   11.2 L
2. 2.

   A box holds 132.03 g of CO₂ (44.01 g/mol) at STP (0 °C, 1 atm, 22.4 L/mol). What volume is that, to 0.01 L, Kira?

   67.2 L
3. 3.

   One sheet uses 100 kPa and gives 22.7 L for 1 mol of gas; another uses 1 atm and gives 22.4 L. Which is true, Luz?

   • Both are right for their own pressure
   • Just one can be right: a mole fills one volume
   • The 22.7 L sheet made an error
4. 4.

   At 0 °C and 100 kPa, about what volume does 2 mol of CO₂ fill, Milo?

   • 44.8 L, using 22.4 L/mol from the 1 atm standard
   • About 22.7 L, as for one mole
   • About 45.4 L
5. 5.

   Ren uses 22.4 L/mol for a balloon of gas at 30 °C. Which reply fits, Noah?

   • Agree, if the gas is carbon dioxide
   • Agree: 22.4 L/mol works at any temperature
   • Disagree: warm gas fills more than 22.4 L per mole
6. 6.

   Baking soda (84.01 g/mol) and vinegar react: NaHCO₃ + CH₃COOH → CH₃COONa + H₂O + CO₂. How much CO₂ at STP does 8.401 g of baking soda give, Pia?

   • 188.18 L, from 8.401 × 22.4
   • 2.24 L
   • 8.401 L, one liter per gram
7. 7.

   In respiration, C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O. How much CO₂ at STP comes from 0.25 mol of glucose, Ren?

   • 0.07 L, from 1.5 ÷ 22.4
   • 33.6 L, from 1.5 mol of CO₂
   • 5.6 L, from 0.25 mol of CO₂
8. 8.

   Which fills more space at STP: 64.00 g of O₂ (32.00 g/mol) or 44.01 g of CO₂ (44.01 g/mol), Zee?

   • The O₂: 2 mol, or 44.8 L
   • The CO₂, since its molecules are bigger
   • They match, since both are gases
9. 9.

   A 22.4 L balloon of O₂ and a 22.4 L balloon of CO₂ at STP: which holds more molecules, Ari?

   • The CO₂, since its molecules are heavier
   • The O₂, since its molecules are smaller
   • Neither: each holds 6.022 × 10²³
10. 10.

    Esme says a mole of CO₂ fills more space at STP than a mole of O₂ because CO₂ is heavier. Which reply fits, Bo?

    • Disagree: a mole of any gas fills 22.4 L at STP
    • Agree: heavier gas molecules take up more room
    • Agree: CO₂ fills 44.01 L, its molar mass in liters