Define or explain the terms:
(a) Vapour density,

(b) Molar volume,
(c) relative atomic mass,

(d) relative molecular mass,
(e) Avogadro's number,

(f) Gram atom,
(g) Mole.

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a)The density of a particular gas or vapour relative to that of hydrogen at the same pressure and temperature.

b)The volume occupied by 1 mole of any substance at a given temperature and pressure is called molar volume. Its equal to molar mass/ density.

1 mole of any substance occupies 22.4 L or 22400 ml volume. This is called molar volume

c)The relative atomic mass of the atom of an element is simply defined as the average mass of the atom, as compared to 112th the mass of one carbon-12 atom. So

A t o m i c space m a s s equals fraction numerator m a s s space o f space a n space a t o m space o f space t h e space e l e m e n t over denominator begin display style 1 over 12 end style cross times m a s s space o f space a n space a t o m space o f space C minus 12 end fraction
d) The ratio of the average mass of one molecule of an element or compound to one-twelfth of the mass of an atom of carbon-12.
Avogadro's number is defined as the number of constituent particles (usually atoms or molecules) in one mole of a given substance. It has dimensions of reciprocal mol and its value is equal to 6.022×1023.

f) Gram atomic mass is the mass, in grams, of one mole of atoms in a monatomic chemical element. It is numerically equal to the relative atomic mass (or atomic weight) in grams.

g)The mole is the unit of measurement for the amount of substance in the International System of Units (SI). One mole of a chemical substance contains 6.022×1023 constitutive particles, which may be atoms, molecules, ions, electrons, or other physical particles.

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