What volume does 3 mol of CO₂ gas occupy at STP? (molar volume 22.4 dm³/mol)

Answer and explanation

Correct answer: D. 67.2 dm³

  1. Step 1: At STP one mole of any ideal gas occupies 22.4 dm³. Step 2. V = 3 × 22.4 = 67.2 dm³. Answer: 67.2 dm³. Why not the others: 132 dm³ is what you get if you use the molar mass instead of 22.4. 7.467 dm³ is what you get if you divide 22.4 by the moles. 72 dm³ is what you get if you use the room-temperature molar volume.

Practise more Physical Chemistry: Moles, Solutions and Stoichiometry.

Free questions with an explanation for every one, and full timed ECAT Pakistan mock tests.

All Physical Chemistry: Moles, Solutions and Stoichiometry questionsTake a mock test

More Physical Chemistry: Moles, Solutions and Stoichiometry questions