Gas volume and moles at standard conditions

Answer Key - Grade 10 Science Worksheet

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

1. 1.

   A leaf gives off 0.75 mol of O₂, measured at STP (0 °C, 1 atm, 22.4 L/mol). What volume is that, to 0.01 L, Bo?

   16.8 L
2. 2.

   A tank holds 4 mol of O₂ at STP (0 °C, 1 atm, 22.4 L/mol). What volume is that, to 0.01 L, Jun?

   89.6 L
3. 3.

   A balloon holds 44.01 g of CO₂ (44.01 g/mol). What volume is that at STP, Kira?

   • 985.82 L, from 44.01 × 22.4
   • 44.01 L, one liter per gram
   • 22.4 L, since it is 1 mol
4. 4.

   What volume does 88.02 g of CO₂ (44.01 g/mol) fill at STP, Milo?

   • 11.2 L, from 0.5 mol
   • 44.8 L, from 2 mol
   • 88.02 L, one liter per gram
5. 5.

   Two balloons at STP each hold 11.2 L, one of CO₂ and one of O₂. Which is true, Noah?

   • The CO₂ balloon holds more moles
   • Each holds 0.5 mol of gas
   • The O₂ balloon holds more moles
6. 6.

   At STP, which has more mass: 22.4 L of O₂ or 22.4 L of CO₂, Pia?

   • The CO₂: 44.01 g against 32.00 g
   • They match, since the volumes match
   • The O₂, since it fills more space per gram
7. 7.

   Which sample at STP holds the most gas particles: 22.4 L of O₂, 22.4 L of CO₂ or 11.2 L of CO₂, Ren?

   • 22.4 L of CO₂, since CO₂ is heavier
   • 11.2 L of CO₂, since CO₂ packs tighter
   • The two 22.4 L samples tie
8. 8.

   Baking soda and vinegar react: NaHCO₃ + CH₃COOH → CH₃COONa + H₂O + CO₂. How much CO₂ at STP does 0.5 mol of baking soda give, Tala?

   • 22.4 L, as each reaction gives 1 mol
   • 0.02 L, from 0.5 ÷ 22.4
   • 11.2 L, from 0.5 mol of CO₂
9. 9.

   In respiration, C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O. How much O₂ at STP does 1 mol of glucose use, Zee?

   • 22.4 L, from 1 mol of O₂
   • 134.4 L, from 6 mol of O₂
   • 0.27 L, from 6 ÷ 22.4
10. 10.

    In photosynthesis, 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. How much CO₂ at STP makes 0.5 mol of glucose, Ari?

    • 11.2 L, from 0.5 mol of CO₂
    • 0.13 L, from 3 ÷ 22.4
    • 67.2 L, from 3 mol of CO₂