Why atomic masses are the average values?


Most of the elements exist in diferent isotopes i.e. atoms with different masses e.g. Cl has two isotopes with mass numbers 35 and 37 existing in the ratio 3:1. Hence average value is taken.
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What is the relation between gram molecular weight and volume of a gas?


22.4 litre of a gas at NTP weighs equal or its gram molecular weight.

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What is atomicity of an element?


Atomicity of an element is the number of atoms contained in one molecule of it.
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What is Avogadro's number?


The number 6·023×1023 is called Avogadro’s number (NA).

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What is the relation between molecular weight and vapour density?


Relation between molecular weight and vapour density is,

Molecular weight  = 2 x vapour density.

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