International General Certificate of Secondary Education (IGCSE) Chemistry Practice Exam

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What is the approximate molar volume of a gas at standard temperature and pressure?

  1. 22.4 cm³

  2. 24,000 cm³

  3. 240 cm³

  4. 12,000 cm³

The correct answer is: 24,000 cm³

The molar volume of a gas at standard temperature and pressure (STP), defined as 0 degrees Celsius (273.15 K) and 1 atmosphere pressure, is approximately 22.4 liters per mole. This can be expressed in cubic centimeters (cm³), where 1 liter is equal to 1,000 cm³, leading to a molar volume of 22,400 cm³ per mole. Choosing the option that indicates 24,000 cm³ is quite close to the accepted value, making it the best representation of the molar volume under the given conditions. The other options fall significantly short when compared to the established molar volume for gases at STP, with values that are not accurate estimations of gases under those standard conditions.

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