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Calculate volumes of gaseous products from gas volume

Quantitative chemistry • Volumes of gases

Key concepts

What you'll likely be quizzed about

  • Molar gas volume represents the volume occupied by one mole of gas at specified temperature and pressure.
  • Typically, the value at room temperature and pressure is 24.0 dm3 per mole; at standard temperature and pressure (STP), it is 22.4 dm3 per mole.
  • Correct use of molar gas volume requires maintaining consistent temperature and pressure for all gases in the calculations.
  • Variations in temperature or pressure alter the volume per mole, confirming the necessity of measuring all gases under uniform conditions.

Flashcards

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Explain when molar gas volume cannot be used directly.

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Molar gas volume cannot be used directly when gases are at different temperatures or pressures without appropriate corrections.

Key notes

Important points to keep in mind

All gas volumes in a calculation must be at the same temperature and pressure for direct use of molar gas volume.

Use 24.0 dm3 mol−1 at room temperature and pressure unless specified otherwise.

Convert cm3 to dm3 (divide by 1000) before using molar gas volume in dm3 mol−1.

Volumes of gases at the same conditions are proportional to the number of moles (use mole ratios).

Follow the three-step method: volume → moles → stoichiometric ratio → volume.

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