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Two gases at the same temperature and pressure occupy equal volumes. What does this mean?
AThey have the same density
BThey have the same molar mass
CThey have the same colour in general usage
DThey contain the same number of molecules (Avogadro's law)
Answer & Solution
Correct answer: A. They have the same density
1. Avogadro's law states that equal volumes of gases at the same T and P have equal moles.
2. Equal moles means an equal count of molecules.
3. Density and molar mass need not be the same.
4. So the meaning is they contain equal numbers of molecules.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 5 'Mole Concept and Stoichiometry'_
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