Multiple choice

Equal volumes of different gases at any definite temperature and pressure have ____.

  1. equal weights

  2. equal masses

  3. equal densities

  4. equal no. of molecules
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is Avogadro's Law: equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules. The number of molecules (not mass, weight, or density) remains constant under these conditions.

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