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��SECOND PAET
GASEOUS LIQUID AND SOLID STATES OF
MATTER
��I. THE GASEOUS STATE
Molecular Volume
In the gaseous state the molecular volume is a colligative property, that is to say, a property which belongs to the whole of the molecule.
One gram-molecule of any gas, measured under normal conditions of temperature and pressure (0°C. and 760 m.m.)," invariably occupies a volume of 22880 cubic centimetres.
In fact, for a gas with molecular weight m, the density with reference to hydrogen is : - - and with reference to air : y
M k,
��\ 2 x 14-435 ;
consequently the weight of one cubic centimetre is :
0*00129 m
and the volume occupied by m grams (or one gram- molecule) will be :
��= 22380 cubic centimetres.
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