Effective volume is usually taken for ____________ ?
Correct answer: B. 1 mole of gas
- A. 2 moles of gas
- B. 1 mole of gas
- C. 5 moles of gas
- D. 3moles of gas
Explanation
In the van der Waals treatment, the effective volume correction is commonly expressed for 1 mole of gas, with the constant b representing the excluded volume per mole. Students may choose 2 moles because volume seems to depend on the amount of gas, but the standard reference amount used for this definition is one mole.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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