What volume does 3 mol of H₂ gas occupy at STP? (molar volume 22.4 dm³/mol)
Answer and explanation
Correct answer: B. 67.2 dm³
- 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: 6 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 Physics and chemistry.
Free questions with an explanation for every one, and full timed DTM University Entrance Test (Uzbekistan) mock tests.
More Physics and chemistry questions
- Which unit is used for force in the SI system?
- A car moving at 20 m/s accelerates at 2 m/s² for 5 s. What is its final speed?
- A resistor of 6 Ω carries a current of 2 A. What is the voltage across it?
- What is the kinetic energy of a 2 kg object moving at 3 m/s?
- A stone falls from rest for 2 s. Taking g = 10 m/s², how far does it fall?
- Which part of the electromagnetic spectrum has the highest frequency?