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Avogadro's Law

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Estimated time: 5 minutes
  • Definition: Atom
  • Definition: Molecule
  • Definition: Avogadro's Law
CISCE: Class 10

Definition: Atom

An atom is the smallest particle of an element that can take part in a chemical reaction; however, it may or may not exist independently. 

CISCE: Class 10

Definition: Molecule

A molecule is the smallest particle of an element or a compound that can exist by itself; it never breaks up except for taking part in a chemical reaction.

CBSE: Class 12
Maharashtra State Board: Class 12
CISCE: Class 10

Law: Avogadro's Law

"Equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules."

  • Proposed by Avogadro in 1811.
  • 1 mole of any gas at STP = 22.4 L (at 0°C, 1 atm) or 22.71 L (at 0°C, 1 bar — new IUPAC STP).
  • 1 mole of any substance = 6.022 × 10²³ particles.

Avogadro's Law (Volume–Moles Relationship):

At constant temperature (T) and pressure (P), volume is directly proportional to number of moles.

\[V\propto n\quad\Rightarrow\quad\frac{V_1}{n_1}=\frac{V_2}{n_2}\]

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Related QuestionsVIEW ALL [8]

The drain cleaner, Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20 °C and one bar will be released when 0.15g of aluminum reacts?

If 10 volumes of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour would be produced?

The weight of 350 mL of a diatomic gas at 0°C and 2 atm pressures is 1 g. The weight of one atom in gram is: (N = Avogadro's number)

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The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?

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