Question

The statement "Equal volumes of all gases at equal temperature and pressure have the same number of molecules", is related to the.
1. Avogadro’s law
2. First law of Dalton atomic theory
3. Second law of Dalton atomic theory
4. None of these

Answer 1

Correct Answer - Option 1 : Avogadro’s law

CONCEPT:

Dalton's atomic theory:

• The scientific ‘Atomic Theory’ is usually credited to John Dalton.
• He proposed the atomic theory to explain the laws of definite and multiple proportions obeyed by elements when they combine into compounds.
• The first law says that any given compound has, a fixed proportion by mass of its constituents.
• The second law says that when two elements form more than one compound, for a fixed mass of one element, the masses of the other elements are in ratio of small integers.
• To explain the laws Dalton suggested, about 200 years ago, that the smallest constituents of an element are atoms.
• Atoms of one element are identical but differ from those of other elements. A small number of atoms of each element combine to form a molecule of the compound.

Avogadro’s law (or hypothesis) says:

• According to this law equal volumes of all gases at equal temperature and pressure have the same number of molecules.

EXPLANATION:

• According to Avogadro’s law, equal volumes of all gases at equal temperature and pressure have the same number of molecules. Hence, option 1 is correct.